1. Section 4.1: polygons

2. Regular polygon:
It is equilateral and equiangular.

3. Quadrilaterals—5 types
Parallelogram:
2 pairs of parallel sides
rhombus
Parallelogram with 4 congruent sides
rectangle
Parallelogram with 4 right angles.
square
Parallelogram with 4 right angles & 4 congruent sides.
Trapezoid
1 pair of parallel sides

4. Quadrilaterals
trapezoid
parallelogram
rhombus
squares
rectangles

5. 2(x + 9) =5x - 6 2x + 18 = 5x - 6 x = 8 A 2(x + 9) B 5x - 6
Quadrilateral ABCD is a rhombus. Find the value of x.
D C
2(x + 9) =5x - 6
2x + 18 = 5x - 6
x = 8

6. 180(n-2) 180(5-2) 180(3) 540 Angle measures in a polygon
the sum of the angle measures of a polygon with n sides is:
180(n-2)
Find the sum of the angle measures in any pentagon.
180(n-2)
180(5-2)
180(3)
540
Assignment: pg 101: 1-13