Question

Suppose the diameter of a circle is 6 units What is its circumference?

Answer 1

18.84 estimated, 6π exactly

Explanation:

Hi!

The formula for finding the circumference of a circle is 2πr:

In that case, all we need to do first is to divide the diameter by 2, so we can substitute that into the equation.

6 ÷ 2 = 3

So we have 2π × 3 to solve.

2π × 3 = 6π

We can estimate the circumference by multiplying by 3.14.

6 × 3.14 = 18.84

(actually multiplying by π gives 18.849... which is pretty close!)

Thus, the circumference is
`\boxed{6\pi{\text{\:or\:18.84\:roughly}}}`.

Hope this helps!