Section 4.1: polygons.

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Presentation transcript:

Section 4.1: polygons

Regular polygon: It is equilateral and equiangular.

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

Quadrilaterals trapezoid parallelogram rhombus squares rectangles

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

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