the area of the semi circle is 50 pi calculate the length the diameter
Are of a semi-circle = (1/2)*pi * (D/2)^2 where D is the diameter...so we have
50 *pi = (1/2)*pi * (D/2)^2 divide both sides by pi, multiply both sides by 2
100 = D^2 / 4 multiply both sides by 4
400 = D^2 take the square root of both sides
20 = D
