Question

Find the area of the semicircle. Round your answer to the nearest whole number, if necessary.

A semicircular object with a radius of 20 centimeters.

area: about
cm2

Answer 1

You can do this by multiplying pi by the radius of 20 squared, this gives you 1256.64. The final step is to work out the area of this semi-circle. You can do this by dividing the area of 1256.64 by 2, this gives you 628.32 . This is because a semi-circle is half of a circle.