​How do you work out the perimeter of a circle?

Perimeter=Circumference

Circumference =Area/Pi

Circumference =Diameter x Pi=Radius x 2 x Pi.

circumference means the perimeter of circle.

Circumference = pi times diameter.

Also Guest #1, Circumference does not equal area divided by pi.

$\text{Circumference}=\dfrac{2\times\text{Area}}{\dfrac{1}{2}\times\text{Diameter}}=\dfrac{4\times \text{Area}}{\text{Diameter}}$ instead.