SOLUTION: Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 3-inch radius A = sq. in. please help i got 27/8 sqrt(3) am i correct or do i need

Question 621294: Find the area of an equilateral triangle (regular 3-gon) with the given measurement.
3-inch radius
A = sq. in.
please help
i got
27/8 sqrt(3)
am i correct or do i need to look at it again
Answer by tomlaidlaw(14) (Show Source): You can put this solution on YOUR website!
I think it is twice your answer.
to get the side we use the formula for Radius and manipulate it to get side. Ris given as 3

Then

which works out to about 11.664, which is very nearly 27/4 sqrt(3)
There are many good articles on the web. For this answer I relied on:
http://en.wikipedia.org/wiki/Equilateral_triangle

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