Find the area of the semicircle. Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi and enter your answer as a decimal.

Answer 1

area of a semicircle = half the area of a circle

area of a circle = pi(r^2)

A/2 = pi(r^2)/2 = 3.14(r^2)/2 = 1.57r^2

the semicircular area = approximately 1.57r^2

or an exact answer is: (pi/2)r^2