Therefore the circumference is 88cm.

When the diameter is given instead of the radius we have another circumference equation.

Let ‘**d**’ be the diameter and ‘**r**’ is the radius.

**d = 2πr** (two times radius equal to diameter)

If the circumference of the circle denoted by ‘**c**’

**c = 2πr**

We can also write circumference of a circle formula as,

**c = 2πr**

**c = π x d (d = 2πr)**

**c = πd**

Chris OConnor….so E1Q3? You asked “Find the circumference of the circle with the measurements Diameter 1712cm” Am I right thinking that should have been d=17-1/2?

AdminYes Chris. It is 17 1/2.