Question

How do you calculate the area of a semicircle with a radius of 7 cm?

Answer 1

The area is `"11 cm"^2`.

Explanation:

The formula for area of a semicircle is:

`A=1/2pir^2`, where `A=`area, `pi=22/7`, and `r=`radius.

With the given data, we write:

`A=1/2xx22/7xx("7 cm")^2`

`A=1/cancel2xx(cancel(22)^11)/cancel7xxcancel7xx "7 cm"^2`

`A= "77 cm"^2`