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Mathematics 7 Online
OpenStudy (summersnow8):

A regular pentagon is inscribed in a circle of radius 1. What percentage of the area of the circle is inside the pentagon?

OpenStudy (zale101):

Area of pentagon = area of 5 triangles

OpenStudy (summersnow8):

i understand that. i did 360/5= 75 degrees, then 72 degrees/2..... but i am stuck on what to do next. I know area of a triangle is A= 1/2 b x h. What do i do next?

OpenStudy (anonymous):

Refer to the attached solution, using Mathematica 9 Home Edition.

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