Question

If `pi` equals `22/7` and the radius of a circle is `1``3/4` in, what is the circumference?

Answer 1

Approximately `11` in

Explanation:

Please note that `pi` is not equal to `22/7`

`22/7` is a rational number equal to `3.bar(142857)`

`pi` is an irrational number whose decimal expansion starts...

`3.141592653589793238462643383279502884...`

Using the approximation `pi ~~ 22/7` and the formula `c = 2pi r` we find:

`c = 2pi r ~~ 2 * 22/7 * 1 3/4 =2 * 22/7 * 7/4 = 44/4 = 11` in