Ch. 8: Pinwheels & polygons

CH. 8: PINWHEELS &

POLYGONS

YOU WILL LEARN… About special types of polygons How the measures of the interior and

exterior angles of a regular polygon are related to the number of sides of the polygon

How the areas of similar figures are related How to find the area and circumference of

a circle and parts of circles and use this ability to solve problems in various contexts

FIRST SECTION! 8.1

PINWHEELS Composed of triangles that are

rotated about a central point

POLYGON Two-dimensional closed figure Made up of straight line segments

connected end-to-end Convex: Connect interior points

without going outside the shape

Regular: If Equilateral (all sides have same length) and Equiangular: all interior angles have equal measure

TRIANGLES CAN BE PLACED TOGETHER TO FORM A VARIETY

OF SHAPES! Formed with 18 triangles from 8-2:

HOMEWORK

8-6 8-11