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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?
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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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