1. Math 10 Geometry Unit Lesson 3 6.2 (1) Properties of a Regular Polygon

2. What is a polygon??? A 2-dimensional closed figure with 3 or more sides. Regular Polygon – all sides and angles are equal

3. Line Symmetry Location where a shape can be folded in equal halves. Rotational Symmetry A property where an object can be rotated around its center and match the original shape at least once before a full rotation. Ex. Equilateral triangle.

4. To calculate angle measures of regular polygons… Divide 360 by the number of “lines of symmetry” (number of sides) of a regular polygon to get the angle located at the center of the shape. ex: 360   6 = 60  Subtract this angle from 180  to get the interior angles of the regular polygon. To get the exterior angles you need to subtract this from 180 . What do you notice???

5. Classwork Properties of regular polygons sheet Answer question 2 pg. 266