Question

a semicircle has a diameter of 18 centimeters. what is its area? (use 3.14 for pi)a 1017.36 cm 2b 56.52 cm 2c 127.17cm 2d 113.04 cm 2

Answer 1

Area of semicircle = 1/2 x pi x r^2; where r = d/2 = 18/2 = 9cm.
Area of semicircle = 1/2 x 3.14 x (9)^2 = 1/2 x 3.14 x 81 = 127.17 cm^2