Find the area of the regular 30-gon with radius 5 mm.
The formula to find the area of a regular polygon given a radius is: Area = [ r2 · n · sin( 360 / n ) ] / 2
where r = radius and n = number of sides.
Area = [ 52 · 30 · sin( 360 / 30 ) ] / 2 = 78 (approximately)
