8.1 Angles of polygons - Chino Valley Unified School District
8.1 ANGLES OF POLYGONS
Find and use the sum of the measures of the interior and exterior angles of a polygon
Polygon Interior Angles Sum
A DIAGONAL of a polygon is a segment that connects any two nonconsecutive vertices
Triangle Quadrilateral
Pentagon
Hexagon
180? 2 180? = 360? 3 180? = 540? 4 180? = 720?
Recall
A POLYGON is a closed figure formed by a finite number of coplanar segments called sides such that: the sides have a common endpoint that are not collinear and each side intersects exactly two other sides, but only at their vertices
Polygons
Sides 3 4 5 6 7 8 9 10 11 12 N
Name Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon
Decagon Hendecagon Dodecagon -
Measure of Interior Angles 1 180? = 180? 2 180? = 360? 3 180? = 540? 4 180? = 720?
5 180? = 900? 6 180? = 1080? 7 180? = 1260? 8 180? = 1440? 9 180? = 1620? 10 180? = 1800?
- 2 180?
Polygon Interior Angle Theorem
The sum of the interior angle measures of an -sided convex polygon - 2 180.
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