Question

What is the area of a pentagon with a radius of 8?

Answer 1

I think there's a formula for it

Answer 2

http://www.mathopenref.com/polygonregulararea.html

Answer 3

152.169

Answer 4

or 152.2

Answer 5

The regular pentagon can be divided into 5 isosceles triangles of equal area. If the circumscribing radius is 8 , the equal sides of the isosceles triangle is 8 and the included angle is 360/5 = 72 degrees

area = 5 x (1/2) x (8)^2 sin72° = 152.169

Answer 6

why 108 and 540?

Answer 7

yea