Question

Find the area and circumference of a circle that has a diameter of 17mm

Answer 1

Area A = 72.25
`$ \pi $` sq. units

Circumference C = 17
`$ \pi $`

Explanation:

The diameter, d of the circle is given to be 17mm.

Since, 2r = d, where r is the radius r =
`$ (17)/(2) $` mm.

Area A of the circle is given by
`$ \pi r^2 $` sq. units.

Therefore, A =
`$ \pi * ((17)/(2)) ^2 $`= 72.25 sq.mm.

Also, Circumference, C =
`$ 2 \pi r $` units.

Therefore, C =
`$  2 * \pi * (17)/(2) $` = 17
`$ \pi $` units.