A semicircle has an area of 76.97 km² . Find its radius

Question

Answer:

Area of a semicircle = 1/2 πr²

1/2 πr² = 76.97

Multiply both sides by 2:
πr² = 153.94

Divide both sides by π:
r² = 49

Square root both sides:
r=√49

r = 7

Answer: r = 7