Question

The diameter of a circle is 6 inches find the circumference to the nearest tenth

Answer 1

Circumference = pi x diameter
6 x pi = 18.8 to one decimal place

Answer 2

18.8 inches

Explanation:

The circumference is
`\displaystyle{C = 2\pi r}`. The diameter is two times of radius which can be expressed as
`\displaystyle{d = 2r}`.

We can rewrite the equation of circumference as
`\displaystyle{C = \pi d}`. Thus, substitute d = 6 in:

`\displaystyle{C = 6\pi}\\\\\displaystyle{C = 18.849}`

Rounding to the nearest tenth, we will get:

`\displaystyle{C = 18.8 \ \sf \ inches}`

Hence, the circumference is 18.8 inches.