SOLUTION: a mirror in the shape of a regualar octagon is mounted on the wall. if the area of the mirror is 18sq. m. find the length of the side of the mirror

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Question 1184051: a mirror in the shape of a regualar octagon is mounted on the wall. if the area of the mirror is 18sq. m. find the length of the side of the mirror
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Area+=+2%281%2Bsqrt%282%29%29s%5E2 where s+is side length
given:
Area+=18m%5E2
2%281%2Bsqrt%282%29%29s%5E2=18m%5E2+
%281%2Bsqrt%282%29%29s%5E2=9m%5E2
s%5E2=9m%5E2%2F%281%2Bsqrt%282%29%29
s%5E2=9m%5E2%2F%281%2Bsqrt%282%29%29
s+=+3m%2Fsqrt%281+%2B+sqrt%282%29%29->exact
s+=1.93m->approximately