How Many Degrees?

This lesson facilitates the discovery of a formula for the sum of the interior angles of a regular polygon. Students will draw all the diagonals from one vertex of various polygons to find how many triangles are formed. They will use this and their prior knowledge of triangles to figure out the sum of the interior angles. This will lead to the development of a formula for finding the sum of interior angles and the measure of one interior angle.
Resource ID#: 31962 Type: Lesson Plan
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General Information

Subject(s): Mathematics
Grade Level(s): 8
Intended Audience: Educators educators
Suggested Technology: Document Camera, Computer for Presenter, Interactive Whiteboard, LCD Projector, Overhead Projector, Scientific Calculator
Instructional Time: 1 Hour(s) 30 Minute(s)
Keywords: regular polygons, interior angles, triangle, angle sum of a triangle, diagonal, degrees, formula, sum
Instructional Component Type(s): Lesson Plan,  Worksheet,  Assessment,  Teaching Idea
Resource Collection: CPALMS Lesson Plan Development Initiative

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