Question

What is the area of a semicircle with a diameter of 20?

Answer 1

`\huge\boxed{\sf 157.1 \ units^2}`

Explanation:

Diameter = 20

Radius = Diameter/2 = 20/2 = 10

Area of semicircle:

`\displaystyle =(\pi r^2)/(2) \\\\r = 10\\\\= (\pi (10)^2)/(2) \\\\= (100 \pi)/(2) \\\\= (314.2)/(2) \\\\= 157.1 \ units^2\\\\\rule[225]{225}{2}`