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Sophia Learning

Sophia: Using Right Triangle Trigonometry to Find the Area of Regular Polygons

For Students 9th - 10th Standards
This lesson will demonstrate how to use right triangle trigonometry and special right triangles (45-45-90 and 30-60-90) to find the area of triangles given the side lengths of the polygon. It is 2 of 4 in the series titled "Using Right...
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Curated OER

Science Kids: Science Images: Equilateral Triangle

For Students 9th - 10th
This picture shows an equilateral triangle, a three sided regular polygon with internal angles of 60 degrees and sides of equal length.
Graphic
Curated OER

Octagon1

For Students 9th - 10th
A complex look at the octagon, which is an eight-sided polygon, from Mathworld.com.

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