SOLUTION: I've got a question for tonights homework in my book that asks me to find the area of a each regular polygon. The question says, " a triangle with side length 9 inches".

Algebra ->  Triangles -> SOLUTION: I've got a question for tonights homework in my book that asks me to find the area of a each regular polygon. The question says, " a triangle with side length 9 inches".      Log On


   

Question 437672: I've got a question for tonights homework in my book that asks me to find the area of a each regular polygon. The question says, " a triangle with side length 9 inches".
Found 2 solutions by robertb, Alan3354:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The area of the equilateral triangle is A+=+%28sqrt%283%29%2As%5E2%29%2F4+=+81sqrt%283%29%2F4 square inches.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The area of all regular polygons with n sides of length s is
Area+=+n%2As%5E2%2Acot%28180%2Fn%29%2F4