# 11-1 Study Guide and Intervention

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1 11-1 Study Guide and Intervention reas of Parallelograms reas of Parallelograms parallelogram is a quadrilateral with both pairs of opposite sides parallel. ny side of a parallelogram can be called a base. Each base has a corresponding altitude, and the length of the altitude is the height of the parallelogram. The area of a parallelogram is the product of the base and the height. rea of a Parallelogram If a parallelogram has an area of square units, a base of b units, and a height of h units, then bh. B h D T C b The area of parallelogram BCD is CD T. Eample Find the area of parallelogram EFGH. bh rea of a parallelogram 30(18) b 30, h Multiply. The area is 540 square meters. E H 18 m 30 m F G Eercises Find the area of each parallelogram ft 18 ft 0 4 in. Find the area of each shaded region. 4. WXYZ and BCD are 5. ll angles are right. EFGH and NPQ are rectangles. angles. rectangles; JKLM is a square. 3 ft W 3 cm X E F 3 ft J K N B 1 cm 3 ft 18 in. 9 in. 9 in. 5 cm 8 ft 3 ft D 1 cm C ft ft M 9 in. L Q 1 in. P H Z Y 1 ft 30 in. G 7. The area of a parallelogram is 3.3 square feet. The base is.8 feet. If the measures of the base and height are each doubled, find the area of the resulting parallelogram. 1. cm 1. cm 8. rectangle is 4 meters longer than it is wide. The area of the rectangle is 5 square meters. Find the length. Chapter 11 Glencoe Geometry

2 11-1 Study Guide and Intervention (continued) reas of Parallelograms Parallelograms on the Coordinate Plane To find the area of a quadrilateral on the coordinate plane, use the Slope Formula, the Distance Formula, and properties of parallelograms, rectangles, squares, and rhombi. Eample The vertices of a quadrilateral are (, ), y B(4, ), C(5, 1), and D( 1, 1). B a. Determine whether the quadrilateral is a square, a rectangle, or a parallelogram. D Graph the quadrilateral. Then determine the slope of each side. C slope of B or 0 4 ( ) slope of C D 1 ( 1) or ( 1) slope D or 3 ( 1) slope B C 1 or pposite sides have the same slope. The slopes of consecutive sides are not negative reciprocals of each other, so consecutive sides are not perpendicular. BCD is a parallelogram; it is not a rectangle or a square. Lesson 11-1 b. Find the area of BCD. From the graph, the height of the parallelogram is 3 units and B 4 ( ). bh rea of a parallelogram (3) b, h 3 18 units Eercises Multiply. Given the coordinates of the vertices of a quadrilateral, determine whether the quadrilateral is a square, a rectangle, or a parallelogram. Then find the area. 1. ( 1, ), B(3, ), C(3, ), and D( 1, ). R( 1, ), S(5, 0), T(4, 3), and U(, 1) 3. C(, 3), D(3, 3), E(5, 0), and F(0, 0) 4. (, ), B(0, ), C(4, 0), and D(, 4) 5. M(, 3), N(4, 1), P(, 1), and R( 4, 3). D(, 1), E(, 4), F( 1, 4), and G( 1, 1) Chapter 11 7 Glencoe Geometry

3 11- Study Guide and Intervention reas of Triangles, Trapezoids, and Rhombi reas of Triangles The area of a triangle is half the area of a rectangle with the same base and height as the triangle. If a triangle has an area of square units, a base of b units, and a corresponding height of h units, then 1 bh. Z X h b Y Eample 1 bh Find the area of the triangle. rea of a triangle 8 m 1 (4)(8) b 4, h 8 33 Multiply. 4 m The area is 33 square meters. Eercises Find the area of each figure Lesson The area of a triangle is 7 square inches. If the height is 8 inches, find the length of the base right triangle has a perimeter of 3 meters, a hypotenuse of 15 meters, and a leg of 9 meters. Find the area of the triangle. Chapter Glencoe Geometry

4 11- Study Guide and Intervention (continued) reas of Triangles, Trapezoids, and Rhombi reas of Trapezoids and Rhombi The area of a trapezoid is the product of half the height and the sum of the lengths of the bases. The area of a rhombus is half the product of the diagonals. If a trapezoid has an area of square units, bases of If a rhombus has an area of square units and b 1 and b units, and a height of h units, then diagonals of d 1 and d units, then 1 h(b 1 b ). 1 d 1 d. b 1 h d d1 b Eample Find the area of the trapezoid. 1 h(b 1 b ) rea of a trapezoid 1 (15)(18 40) h 15, b 1 18, b Simplify. The area is 435 square meters. 15 m 40 m 18 m Eercises Find the area of each quadrilateral The area of a trapezoid is 144 square inches. If the height is 1 inches, find the length of the median. 8. rhombus has a perimeter of 80 meters and the length of one diagonal is 4 meters. Find the area of the rhombus. Chapter 11 1 Glencoe Geometry

5 11-3 Study Guide and Intervention reas of Regular Polygons and Circles reas of Regular Polygons In a regular polygon, the segment drawn from the center of the polygon perpendicular to the opposite side is called the apothem. In the figure at the right, P is the apothem and R is the radius of the circumscribed circle. rea of a Regular Polygon If a regular polygon has an area of square units, a perimeter of P units, and an apothem of a units, then 1 Pa. V R U P S T Eample 1 Verify the formula 1 Pa for the regular pentagon above. For RS, the area is 1 bh 1 (RS)(P). So the area of the pentagon is 5 1 (RS)(P). Substituting P for 5RS and substituting a for P, then 1 Pa. Eample Find the area of regular pentagon RSTUV above if its perimeter is 0 centimeters. First find the apothem. The measure of central angle RS is 3 0 or 5 7. Therefore, m RP 3. The perimeter is 0, so RS 1 and RP. tan RP R P P tan 3 P P tan 3 8. Eercises Find the area of each regular polygon. Round to the nearest tenth m 10 in So, 1 Pa 1 0(8.) or The area is about 48 square centimeters. 15 in m 5 3 cm 10 in. 7.5 m Chapter 11 Glencoe Geometry

6 11-3 Study Guide and Intervention (continued) reas of Regular Polygons and Circles reas of Circles s the number of sides of a regular polygon increases, the polygon gets closer and closer to a circle and the area of the polygon gets closer to the area of a circle. rea of a Circle If a circle has an area of square units and a radius of r units, then r. r Eample Circle Q is inscribed in square RSTU. Find the area of the shaded region. side of the square is 40 meters, so the radius of the circle is 0 meters. R Q S 40 m The shaded area is rea of RSTU rea of circle Q 40 r m U 40 m T Eercises Find the area of each shaded region. ssume that all polygons are regular. Round to the nearest tenth in. in. in. 4 m 1 m 1 m 1 m Lesson 11-3 Chapter 11 3 Glencoe Geometry

7 11-4 Study Guide and Intervention reas of Composite Figures Composite Figures composite figure is a figure that can be seprated into regions that are basic figures. To find the area of a composite figure separate the figure into basic figures of which we can find the area. The sum of the areas of the basic figures is the area of the figure. Eample 1 Find the area of the composite figure. 50 ft 30 ft The figure is a rectangle minus one half of a circle. The radius of the circle is one half of 30 or 15. lw 1 r 50(30) 0.5 (15) 114. or about 1147 ft Eample Find the area of the shaded region. 5 cm The dimensions of the rectangle are 10 centimeters and 30 centimeters. The area of the shaded region is (10)(30) 3 (5 ) cm Eercises Find the area of each figure. Round to the nearest tenth if necessary ft. 15 ft cm 10 cm cm 40 cm 5. 4 m. 0 m 0 m 40 m 4 in. 40 in. cm 4 cm 35 yd 4 in. 15 yd Lesson Refer to Eample above. Draw the largest possible square inside each of the three circles. What is the total area of the three squares? Chapter 11 9 Glencoe Geometry

8 11-4 Study Guide and Intervention (continued) reas of Composite Figures Composite Figures on the Coordinate Plane To find the area of a composite figure on the coordinate plane, separate the figure into basic figures. Eample Find the area of pentagon BCDE. Draw B X between B(, 3) and X(4, 3) and draw D. The area of BCDE is the sum of the areas of BCX, trapezoid BXD, and DE. area of BCX area of BXD area of DE 1 ()() 1 (3)( 7) 1 ()(7) square units B(, 3) ( 3, 0) y C(4, 5) X D(4, 0) E(0, ) Eercises Find the area of each figure. Round to the nearest tenth. 1.. y 3. y H(0, 4) M(0, 3) y Q(0, 4) G(, ) F(, ) J(, ) K(, ) L(, 0) N(, 0) P(0, ) T ( 3, 0) R (4, 0) S(0, ) 4. y 5. y. U(, ) Z(, ) 7. pentagon BCDE 8. pentagon RSTUV B(, 3) ( 3, ) V( 1, 3 1 ) Y( 1, 3 1 ) y W(1, ) C(3, 5) E(, 3) X(1, ) D (5, 0) ( 1, 4) D ( 3, 0) B(4, 4) C(4, 3) S( 1, 5) R (, 0) y T(, ) V(4, 0) K ( 3, 0) U (4, 3) E (, 4) y F(0, ) G(4, 4) H (4, 0) J(1, ) Chapter Glencoe Geometry

9 11-5 Study Guide and Intervention Geometric Probability and reas of Sectors Geometric Probability The probability that a point in a figure will lie in a particular part of the figure can be calculated by dividing the area of the part of the figure by the area of the entire figure. The quotient is called the geometric probability for the part of the figure. If a point in region is chosen at random, then the probability P(B) that the point is in region B, which is in the interior of region, is P(B) a rea of region B. area of region Eample Darts are thrown at a circular dartboard. If a dart hits the board, what is the probability that the dart lands in the bull s-eye? rea of bull s-eye: () or 4 rea of entire dartboard: (10) or 100 The probability of landing in the bull s-eye is area of bull s-eye 4 area of dartboard or in. in. 4 in. Eercises Find the probability that a point chosen at random lies in the shaded region. Round to the nearest hundredth if necessary cm cm 1 cm 8 8 Chapter 11 3 Glencoe Geometry

10 11-5 Study Guide and Intervention (continued) Geometric Probability and reas of Sectors Sectors and Segments of Circles sector of a circle is a region of a circle bounded by a central angle and its intercepted arc. segment of a circle is bounded by a chord and its arc. Geometric probability problems sometimes involve sectors or segments of circles. segment sector If a sector of a circle has an area of square units, a central angle measuring N, and a radius of r units, then 3 N 0 r. Eample regular heagon is inscribed in a circle with diameter 1. Find the probability that a point chosen at random in the circle lies in the shaded region. The area of the shaded segment is the B C area of sector F the area of F. N rea of sector F 3 0 r 1 D 0 ( 3 0 ) F E rea of F 1 bh 1 ()(3 3 ) 9 3 The shaded area is 9 3 or about 3.. The probability is ar ea of se area of gment circle 3. 3 or about Eercises Find the probability that a point in the circle chosen at random lies in the shaded region. Round to the nearest hundredth cm in Lesson 11-5 Chapter Glencoe Geometry

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