Use SOHCAHTOA
Find the central angle
360/5
72
72/2
36
You now have a right triangle where the angle is 36 and one side is 6.2
You need to find a side
Use tan because it is opposite (side/2) and you have the adjacent (6.2)
Tan36 = s(/2) / 6.2
6.2tan36 = 4.5
4.5 x 2 = 9
One side is 9 mm
9 x 5 is 45
Perimeter = 45 mm
Use perimeter x apothem / 2 to find the area
6.2 x 45 / 2
Area is 139.5 mm squared
