Question

The length of the arc of semi circle is 15 cm calculate the area of the semi circle ?​

Answer 1

L = pi R length of arc of semi-circle

A = pi R^2 area of circle

A = pi * (L / pi)^2 substituting from first equation

A = L^2 / pi = 15^2 / 3.14 = 71.6 cm^2