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January 29, 2015

January 29, 2015

Posted by **Cassie** on Tuesday, March 10, 2009 at 3:36pm.

a) pentagon

b) octagon

c) dodecagon

How would I figure this out?

- Algebra -
**Damon**, Tuesday, March 10, 2009 at 3:42pmadd up the exterior angles between the extension of one side and the next side.

They must add up to 360 because they go all the way around.

Then the interior angle is the supplement.

For example for a regular pentagon

exterior between side extension and side = 360/5 = 72

so each interior angle is

180 - 72 = 108

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