Ch. 8: Pinwheels & polygons
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Transcript of 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