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Math 10 Geometry Unit Lesson 3 6.2 (1) Properties of a Regular Polygon What is a polygon??? A 2-dimensional closed figure with 3 or more sides. Regular Polygon – all sides and angles are equal 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. 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??? Classwork Properties of regular polygons sheet Answer question 2 pg. 266