Question

How do you find the area of a circle with diameter 31.6 cm?

Answer 1

Area of a circle is calculated by `pir^2`

Explanation:

The r in the formula stands for radius, which is half of the diameter's length. Here, the question states that the diameter is 31.6 cm, so we must divide it by 2 to get the radius.

`31.6/2=15.8 rarr` 15.8 cm is the radius's length

The radius needs to be squared (multiplied by itself), and then multiplied by `pi` to find the area.

`15.8^2=249.64`

`pi` is an irrational number. It never terminates or repeats. In most problems, 3.14 or 3.14159 is used as an approximation of `pi`. If not, then you can simply leave your answer in the form `249.64pi`.

`249.64*3.14=783.8696` (cm squared- unit)

`249.64*3.14159=784.2665276` (cm squared- unit)