Examples: Identify the following as equilateral, equiangular or regular. Using Variables: S = 180(n 2)

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1 Ch. 6 Notes 6.1: Polygon Angle-Sum Theorems Examples: Identify the following as equilateral, equiangular or regular. 1) 2) 3) S = 180(n 2) Using Variables: and Examples: Find the sum of the interior angles of each polygon. Then find the measure of each interior angle. 4) Decagon 6) Heptagon 7) 15-gon Examples: The sum of the angle measures of a polygon with n sides is given. Find n. 8) 900 9) 1440

2 Example: Find the missing variables. 10) What is special about the value of the interior angle and exterior angle at the same vertex? Using Variables Examples: Find the measure of an exterior angle of each regular polygon. 11) 12-gon 13) 24-gon Examples: Find the number of sides of a regular polygon given the measure of the exterior angle. 14) 20 Example: Find the number of sides of a regular polygon with an interior angle measure given. 15) 144

3 6.2: Properties of Parallelograms Parallelogram: Opposite Sides: Opposite Angles: Diagrams Draw a diagram to model each of the theorems mentioned above. Examples: Find the variable in the following figures. 1) 2) 3) 4)

4 What is true about BD and DF? Examples: In the figure, GH = HI = IJ. Find each length. 5. EB 6. BD 7. AF 8. AK 9. CD 10. GJ 11. Complete a two-column proof. Given: QRST, TSVU Prove: RQ VU

5 6.3: Proving that a Quadrilateral is a Parallelogram Examples: Write P if the statement describes a parallelogram or appears to be a parallelogram. Write N if it does not. Explain your reasoning. 1) 5 congruent sides 2) Regular Quadrilateral 3) 4) HOW DO WE PROVE THAT A QUADRILATERAL IS A PARALLELOGRAM? DIAGRAMS: Model each theorem above on the given quadrilaterals.

6 Examples: Find the values of the variables that must make each quadrilateral a parallelogram. 5) 6) 7) 8) Examples: Are the following parallelograms? If so, state the theorem that justifies it. If not, write not possible. 9) 10) 11) 12) 13) Prove the following. Given: HGD HEF Prove: DEFG is a parallelogram D E H G F

7 6.4: Properties of Rhombuses, Rectangles and Squares Examples: Complete each statement with always, sometimes or never.

8 DIAGRAMS: Examples: Decide whether the parallelogram is a rhombus, a rectangle, or a square. Explain \ Examples: Find the measure of each numbered angle in the rhombus Examples: QRST is a rectangle. Find the value of x and the length of each diagonal. 7. QS x and RT = 6x QS 5x + 12 and RT 6x 2

9 6.5: Conditions for Rhombuses, Rectangles and Squares Draw a polygon that has no diagonals. Draw a polygon that has 2 diagonals. Draw all of the diagonals from one vertex in the polygon. Theorem 6-18 If the diagonals of a parallelogram are congruent, then the parallelogram is a rectangle. Examples: Can you conclude that the parallelogram is a rhombus, rectangle, square or none. Explain. 1) 2) 3)

10 Examples: Find the value of x that makes the special parallelogram. 4) rectangle 5) rhombus 6) square 7) rectangle 8) rhombus 9) rhombus 10) rectangle 11) rectangle 12) rhombus

11 6.6: Trapezoids and Kites Midsegment of a Trapezoid: Examples: Find the measure of the numbered angles or the value of the variable. 1) 2) 3) AC = x +5; BD = 2x - 7

12 4) 5) Kite: A quadrilateral with and no opposite sides. of consecutive sides that are Examples: Find the measures of the numbered angles inside each kite. 6) 7) 8) Examples: Find the values of the variables in each. 9) 10)

13 6.7: Polygons in a Coordinate Plane You can classify figures in a coordinate plane by using formulas and characteristics we have learned. Classifying Triangles Example 1: Is the triangle with vertices A(0,1), B(4,4) and C(7,0) scalene, isosceles or equilateral. Classifying Parallelograms: Example 2: Is a quadrilateral with vertices M(0,1), N(-1,4), (P(2,5) and Q(3,2) a rectangle, square or both?

14 Example 3: A quadrilateral has vertices quadrilateral is formed by connecting the midpoints of the sides? What special y x

15 6.8: Applying Coordinate Geometry Sometimes variables are used as coordinates. Apply your techniques of the coordinate plane as well as formulas we have learned to find missing values. Example: A rectangle is placed in a convenient position in the first quadrant of a coordinate plane. What is the missing label for the vertex? y (0,a) (_?_, _?_) (0,0) (b,0) x Example: The vertices of the trapezoid are the origin along with A(4a, 4b), B(4c, 4b), and C(4d, 0). Find the midpoint of the midsegment of the trapezoid. y A B (0, 0) C x Example: For the parallelogram, find coordinates for P without using any new variables. y (a, b) P 0 c x

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