Question

If the radius of a circle is 55 inches, what is the area, circumference, and the diameter?

Answer 1

Diameter: 110 inches
Area: `3025pi` inches squared
Circumference: `110pi` inches

Explanation:

Diameter: `2r rarr` `r` represents the radius

`55*2=110 rarr` 110 inches would be the diameter

Area: `pir^2`

`55^2pi=3025pi rarr` `3025pi` would be the area

Circumference: `2pir` or `2d rarr` `d` represents the diameter

`110*pi=110pi`

If you are using an approximation for `pi`, such as 3.14, 3.14159 or `22/7`, multiply 3025 and 110 by the approximations instead of leaving it in terms of `pi`.