Question

Find the area of a regular pentagon with a side of 6ft. answer nearest tenth

Answer 1

See the answer for a nonagon and proceed the same way:

http://www.jiskha.com/display.cgi?id=1337912555

Answer 2

61.9

Answer 3

A=1
45(5+25)a2=1
4·5·(5+2·5)·122≈247.74875in²