Question

The radius of a circle with area A is approximately $\sqrt{\frac{A}{3}}$ . The area of a circular mouse pad is 45 square inches. Estimate its radius to the nearest tenth.

Answer 1

A =
`\pi`
`r^(2)`

45 =
`\pi`
`r^(2)`

45/
`\pi` =
`r^(2)`

14.3 =
`r^(2)`

r = 3.8