# Geo 9 Ch 11 1 AREAS OF POLYGONS SQUARE EQUILATERAL TRIANGLE

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1 Geo 9 h 11 1 RES OF POLYGONS SQURE RETNGLE PRLLELOGRM TRINGLE EQUILTERL TRINGLE RHOMUS TRPEZOI REGULR POLY IRLE R LENGTH SETOR SLIVER RTIO OF RES SME SE SME HEIGHT

2 Geo 9 h reas of Polygons Postulate 17 The area of a square is the square of the length of a side. = s 2 Postulate 1 If two figures are, then they. Postulate 19 rea ddition Postulate : The area of a region is the sum of the areas of its non-overlapping parts. Theorem 11-1 The area of a rectangle equals the product of the base and the height = bh lassify as true or false 1. If two figures have the same area, then they must be congruent. 2. If two figures have the same perimeter, then they must have the same area. 3. If two figures are congruent, then they must have the same area. 4. Every square is a rectangle. 5. Every rectangle is a square.. The base of a rectangle can be any side of the rectangle. Given the following information for a rectangle, find the missing piece: 7. base = 12 m, height = 3 m, rea =. base = 9 m, height =, rea = 54 m base = 4 3 m, height = 5 3 m, rea = 10. base = y-2, height = y, rea = Find the area of the following, given consecutive sides of the figures are perpendicular

3 Geo 9 h reas of parallelograms, triangles, and rhombuses Theorem 11-2: The area of a parallelogram equals the product of a base times the height to that base. = bh Look familiar?? Watch this: parallelogram chop and move surprise!! rectangle Theorem 11-3 The area of a triangle equals half the product of a base and the height to that base. = 2 1 bh. Theorem 11-4 The area of a rhombus equals = bh = 2 1 d1 x d 2

4 Geo 9 h Find the area of each figure. Make sure to draw a picture!! 1. Triangle with base = cm and corresponding height = 9 cm. 2. Parallelogram with base 4 3 and corresponding height Rhombus with diagonals and. 4. n isosceles triangle with sides 12, 12 and n equilateral triangle with all sides

5 Geo 9 h rea parallelogram rea 10 Rhombus 11. Perimeter = 4 rea = 0

6 Geo 9 h rea Rhombus = 10 E = 12 rea E 14. rea

7 Geo 9 h reas of trapezoids What was a trapezoid? What was a median? Theorem 11-5 The area of a trapezoid equals half the product of the height and the sum of the bases. = 2 1 h (b1 + b 2 ) 1 Think: What is (b1 b2 )? So, another form of the equation would be 2 = 1. In trapezoid TRP, R TP m T = 0, R = 10, TR = and TP = 15. Find the area. 2. In isosceles trapezoid, the legs are and the bases are and 14. Find the area. 3. trapezoid has an area of 75 and a height of 5. How long is the median? Find the area of each trapezoid

8 Geo 9 h rea rea rea

9 Geo 9 h reas of regular polygons Each polygon can be thought of as a group of regular, congruent triangles. First, some definitions enter : is the center of the circumscribed circle. Radius : distance from the center to a vertex entral ngle: an angle formed by two radii drawn to the consecutive vertices. pothem : the (perpendicular) distance from the center of the polygon to a side. Identify each in the following picture: Theorem 11- The area of a regular polygon is equal to half the product of the apothem and the perimeter. = 2 1 a p Find the measure of the central angle of each figure: 1. square 2. regular hexagon

10 Geo 9 h regular octagon sided polygon Find the perimeter and the areas of each figure: (umm draw a picture?) 5. regular hexagon with apothem. regular octagon with side 5 and apothem n equilateral triangle with apothem.

11 Geo 9 h omplete the table for the figure. square: a) 5 2 r a P b) 3 9. n equilateral triangle a) r a P b) regular hexagon a) r a P b) 24 3

12 Geo 9 h REVIEW h RE 1) Find The area of each of the following: a) rectangle whose base is and whose diagonal is 10. b) square whose diagonal is. c) parallelogram having two adjacent sides of 12 and 15 cm with an included angle of 0. 2) Find the dimensions of each of the following: a) square whose area is 144 cm 2. b) rectangle whose area is 75 and whose base and height are in the ratio of 3:1. c) rectangle having an area of 135 and whose base is x+2 and height is 2x+1. Find the areas of the following figures: 3) 5) 4) ) 7) ) d2 d1 9) 10) ) d1 = 13 d2 = 12) The area of an equilateral triangle is given. Find the length of a side. a) 1 3 b) ) Find the length of the shorter diagonal of a rhombus if a) The length of the longer diagonal is 15 and the area is 90. b) The lengths of the diagonals are in the ratio of 2:3 and the area of the rhombus is ) Find the length of an altitude of a trapezoid if a) Its area is 72 and the sum of the bases is 3. b) Its area is 0 and its median is 1. c) The sum of the bases is one-third of the area of the trapezoid. 15) Find the area of a rhombus if its perimeter is and one diagonal is 1. 1) Find the area of a triangle if the length of a pair of adjacent sides are and 14, and the included angle is a) 90 b) 30 c) 120

13 Geo 9 h ) Find the measure of a central angle for a regular octagon. 1) If the measure of an interior angle of a regular polygon is 150, find the measure of the central angle. 19) Find the area of a regular hexagon inscribed in a circle having a diameter of 20 cm. 20) Fill in the table for a regular polygon having four sides : Side Radius pothem rea a cm b 49cm 2 c 5cm d cm 21) The length of a side of a regular decagon is 20 cm. Find the apothem. Use trig. Find the area of the following: 22) square with a diagonal of. 23) rectangle with base 12 and perimeter 3. 24) triangle with sides of lengths 17,30, ) n equilateral triangle with height ) square with radius ) regular hexagon with perimeter ) 10 29) 30) ) parallelogram has sides of lengths 12 and 1. The longer altitude has length 9. How long is the shorter altitude?

14 Geo 9 h HPTER ELEVEN REVIEW NSWERS 1) 4, 32, ) 12 x 12, 5 x 15 9 x 15 3) 0 4) ) 10 2 ) 9 3 7) 104 ) 52 9) ) 12 11) ), ) 12, 14 14) 4, 5, 15) 240 1) 42,21, ) 45 1) 30 19) ) 21) ) 3 23) 4 24) ) 1 3 2) 3 27) ) 19 29) ) 13 31)

15 Geo 9 h ITIONL REVIEW (1) Find the area of the figure (2) Find the area and perimeter (3) Find the area of the if consecutive sides are of the square below. rectangle below (4) Find the area of the (5) Find: area () Find the area of the parallelogram below., rectangle below (7) Find the area of the isosceles triangle whose legs measure and whose base is 12. () Find the area and perimeter of an equilateral triangle whose height is 4 3. (9) Find the radius and area of a regular hexagon whose apothem is 4. (10) Find the radius, apothem and area of a square whose perimeter is 24. (11) Find the area of the trapezoid below. (12) Find the area and perimeter of the triangle below

16 Geo 9 h 11 1 (13) Find: area parallelogram (14) Rectangle is inscribed in the circle E, F with center O. The radius of the circle is 5. Find the area of the rectangle. 1 E O F (15) Find the area and perimeter of the (1) Find the area of the trapezoid below. trapezoid below (17) Find the area and perimeter of rhombus (1) Find the area of the hexagon below given below if = 10, = 24. sides and angles as marked. Find: E E F F E

17 Geo 9 h nswers (1) area = 99 (2) area = 12, perimeter = 3 (3) area = 0 (4) area = 50 (5) a = 24, = 10, = 24 5 () area = 9 3 (7) area = 12 7 () area = 1 3, perimeter = 24 (9) radius = 3 3, area = 32 3 (10) radius = 3 2, apothem = 3, area = 3 (11) area = 0 (12) area = 3 3, perimeter = (13) a = 9, E = 12, F = 2 7 (14) area = 4 (15) area = , perimeter = (1) area = 15 (17) area = 120, perimeter = 52, E = (1) area =

18 Geo 9 h ircumferences and reas of ircles ircumference of a circle with radius r ircumference of a circie with diameter d rea of a circle with radius r The radius of O is three times the radius of R. 1. What is the ratio of the circumference to the diameter for each of the two circles? 2. ompare the circumferences of those same two circles. 3. ompare the areas of the same two circles. 4. Fill out the following chart for M r a) 15 b) c) 2 d) 100. The diameter of the world s largest pizza is 1 m. Find the circumference of the crust.

19 Geo 9 h ooperative Learning Experiment reate your own formulas!! Using the following problems as examples, create a general formula that you can use for any similar problem. 1) Find the area of the shaded region, called a sector, if the measure of the arc = 0, and the radius O= 5. O 2) Repeat #1, but = 135 and O = 4. O 3) Repeat #1, but = 235 and O = 3. 4) Repeat #1, but = x and O = r. Share this with Mrs. McGrath. When this is correct, you will have the formula for finding the area of a sector. Now repeat examples #1 thru #3, but instead of finding the area of the sector, find the length of the arc, given the same information. 5) 0, O = 5 ) 135, O = 4 O 7) 235, O = 3 ) Formula for finding the arc length (not measure, which is in degrees) on a circle. Use x, and O = r. Share this with Mrs. McGrath.

20 Geo 9 h rc Lengths and reas of Sectors Sector of a circle is The length of a sector is its portion of the whole circumference, and the area of a sector is its portion of the whole area. Therefore the formulas are: rc Length = O rea of sector O = Now find the area of the region bounded by and. We call it a sliver. What were the steps taken to get this area? Write a basic strategy in words, then share it with Mrs. McGrath. 120 O

21 Geo 9 h Next find the area between the lines. Set up a strategy first and share it with Mrs. McGrath Finally, do problem #2 on page 455. gain, set up a strategy before completing the problem.

22 Geo 9 h Ratios of reas We will be comparing areas of figures by comparing ratios areaof ase 1: ompare two triangles with equal heights areaof h a b ase 2: ompare two triangles with equal bases areaof areaof h k x ase 3: ompare two triangles that are similar E areaof areaof EF h k a F b What conclusions can we make? If two triangles have equal heights, then the ratios of their areas = If two triangles have equal bases, then the ratios of their areas = If two triangles are similar, then the ratios of their areas = Find the ratios of the areas of the two figures below: 1. : 2. :

23 Geo 9 h Theorem 11-7 If the scale factor of two similar figures is a:b, then 1) The ratio of the perimeters = 2) The ratio of the areas = 3. The ratio of the corresponding heights of two similar triangles is 3:5. a) The ratio of the corresponding sides is b) The ratio of the perimeters is c) The ratio of the areas is 4. The diameters of two circles are 10 cm and 9 cm. What is the ratio of their circumferences? Their areas? 5. pentagon with sides 5, 7,, 9, and 11 has an area of 9. Find the perimeter of a similar pentagon whose area is 24.. Find the ratio of the areas of triangles I and II, and triangles I and III. 2 I II 4 III

24 Geo 9 h PQRS, T is a midpoint. a) If the area of PQRS is 0, find the areas of the regions I,II,III,IV. b) If T divides QR such that QT x, find the ratio of the areas of region I to PQRS. TR y P S III IV II I Q T R

25 Geo 9 h Triangle is a right triangle, E and F are midpoints,, H, and G divide into 4 = segments. Find: a) the ratio of areas of to EF. b) the ratio of areas of to GF. c) the ratio of areas of E to GF. d) the ratio of areas of EFG to. e) the perimeter of EFG if = 20 E H G F

26 Geo 9 h 11 2 hapter Eleven Review rea (1) Find the area and circumference of a circle whose radius is 5 2. (2) Find the area between a circle and an inscribed equilateral triangle if each side of the triangle measures. (3) Find the area of a circle below if (4) Given the figure below, Find: each side of the hexagon is. length of, area of shaded region (5) In a circle whose radius is, a sector has an area of 15. Find the length of the arc of the sector. () The lengths of the sides of a triangle are 4, 5, and 7. The shortest side of a similar triangle is 10. Find the perimeter of the second triangle. (7) Find the area of the shaded region () Find the area of the shaded region in the figure below. in the figure below. 4 O

27 Geo 9 h (9) Find the sum of the areas of the (10) Find the area of the shaded region in the shaded regions in the figure below. square below if is the center of. E O (11) Find the area of the shaded region (12) Find the sum of the areas of the shaded in the figure below if =. regions if is an isosceles 90 trapezoid (13) Find the area of the shaded region if (14) Find the area of the shaded region and the is a square, and arcs E and E are semicircles.. length of arc in the figure below. 135 E O

28 Geo 9 h 11 2 (15) Find the sum of the areas of the shaded (1) regions in the figure below if. Find the area of the shaded region in the figure below if points,, and are the centers of arcs F, EF, and E respectively E F 4 12 (17) Given the figure below,, sides as (1) Given the figure below, is a marked, find each of the following ratios. parallelogram, a F = 50. Find: a F, a F, a EF, a EF (a) a a (b) a I a II (c) a II a III (d) a I a IV (e) a III a IV (f) a I a II 5 I E IV 3 III 5 F 3 E (19) Two similar triangles have areas of 12 and 27. The shortest side of the smaller triangle is. Find the shortest side of the larger triangle.

29 Geo 9 h h 11 Sector nswers (1) area = 50, circumference = 10 2 (2) area between = (3) 27 (4) arc length = 3 3 (5) 5 () 40 (7) 4 () 4 (9) 25 4 (10) 4 1 (11) (12) 24 2 (13) 4 (14) area = 24, arc length = (15) 30 4 (1) 1 3, area shaded region = (17) (a) a 1 = a 1 (b) a I 3 = a II 5 (c) a II 1 = a III 1 (d) a I 9 = a IV 25 (e) a III 3 = a IV 5 (f) a I 9 = a 4 (1) a F = 0, a F = 30, a EF = 1, a EF = 30 (19) 9

30 Geo 9 h hapter 11 Supplementary Problems Prior to 11.1 (reas of Rectangles) 1. The length of a rectangle is (3x 4) and the width is (2x 1). Find the perimeter and area of this rectangle by-12 rectangular picture is framed by a border of uniform width. Given that the combined area of the picture plus the frame is 10 square units, find the width of the border. 3. If the perimeter of a square is 3 what is the length of a diagonal of the square? If the area of the square is also 3, what is the length of a diagonal of the square? 4. paper towel tube has a diameter of 4 inches and a height of 11 inches. If the tube were cut and unfolded to form a rectangle, what would the area of that rectangle be? Prior to 11.2 (reas of Parallelograms, Triangles and Rhombuses) 5. Find the area of a triangle with sides 10, 10, and.. Sketch a rhombus with perpendicular diagonals labeled d1 and d 2. Find the area of the rhombus by using the triangles created by the diagonals and come up with a simplified equation for the area in terms of d1 and d raw a parallelogram and drop an altitude.( The perpendicular distance between 2 parallel lines.) an you create a rectangle from the parallelogram and if so what would the area be?. raw an equilateral triangle. rop an altitude to one of the sides. If a side of the triangle is labeled s, come up with a formula for the area of an equilateral triangle using s. oes this formula work for any triangle?

31 Geo 9 h Prior to 11.3 (reas of Trapezoids) 9. Sketch a diagram of an isosceles trapezoid whose sides have lengths 7 in., 10 in., 19 in., and 10 in. Find the altitude of this trapezoid (the distance that separates the parallel sides), then find the enclosed area. 10. trapezoid has two 0 degree angles and in. and 12 in. parallel sides. How long are the nonparallel sides? What is the trapezoid s area? 0 Prior to 11.4 (reas of Regular Polygons) 11. hexagon is inscribed in a circle of radius. ( ll regular polygons can be inscribed in a circle) Find the area of the hexagon by dividing it into shapes you know how to find the area of. 12. Find the area of a square inscribed in a circle with a radius of.

32 Geo 9 h Prior to 11.5 (ircumferences and reas of ircles) 13. The track around Parsons Field is shaped like a rectangle with a semicircle on each of the ends. The distance around the track is one-quarter mile. The straightaway is twice as long as the width of the field. What is the area of the field enclosed by the track to the nearest square foot? Use a calculator. 14. The figure shows three circular pipes all with 12 inch diameters that are held together by a metal strap. How long is the band? Prior to 11. (rc Lengths and Sector reas) 15. In a group of 12 students, only 4 of them like olives on their pizza. If they are sharing a 1 in. pizza, what is the area of the part of the pizza covered with the olives? 1. sector of the circle is the region bounded by two radii and an arc. It s area is a fractional amount of the area of the circle. ompare the areas of two sectors if: a) they have the same central angle but the radius of one is twice as long as the radius of the other. b) they have the same radius but the central angle of one is twice as large as the central angle of the other.

33 Geo 9 h Prior to 11.7 (Ratios of reas) 17. raw a large triangle and mark on segment so that the ratio : is equal to 3:4. Mark any point P on segment. a) Find the ratio of the area of to the area of. b) Find the ratio of the area of P to the area of P. c) Find the ratio of the area of P to the area of P. P 1. The areas of two similar triangles are 24 square cm. and 54 square cm. The smaller triangle has a cm. side. How long is the corresponding side of the larger triangle? 19. The areas of two circles are in the ratio of 25:1. What is the ratio of their radii?

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