Question

How do you find the circumference and the area of a circle with diameter 2ft?

Answer 1

Area = `pi " ft"^2 ->` approx 3.14 square feet
circumference = `2pi` ft -> approx. 6.24 feet (`6" feet " 3 3/8 "inches"`)

Explanation:

Let the radius of a circle be r, then:

Area is `pi r^2 -> pi times (1 " foot")^2 = pi`
Circumference is `2 pi r -> 2 times pi times 1 "foot" = 2 pi`

The number `pi` converted to feet and inches is:
3 feet + approx. `1 11/16` inches

So using decimals:
area is approx.: `3.14` square feet
Circumference is approx.: `6.24` feet