Question

Find the area of circle when diameter is d

Answer 1

Explanation:

Area formula is

`\pi {r}^(2)`

and we know that

`2r = d`

Isolate r.

`r = (d)/(2)`

Plug d/2 for r.

`\pi( (d)/(2) ) {}^(2)`

or

`\pi( (d)/(4) )`