Question

Please help me. I don't understand how to do this.
What is the area of a regular pentagon with a side of 12 in.? Round the answer to the nearest tenth.
A. 495.5 in^2
B. 311.8 in^2
C. 247.7 in^2
D. 124.7 in^2

Answer 1

Are all the sides 12"?

Answer 2

I'm not sure but I think so.

Answer 3

ok

Answer 4

do u know your formula?

Answer 5

\[A=\frac{ 1 }{ 4 }*\sqrt{5*(5+2\sqrt{5})} * a^2\]

Answer 6

1=side of pentagon