Question

Suppose the radius of a circle is 8\color{purple}{8} 8 start color purple, 8, end color purple units. What is its circumference?

Answer 1

The number $\pi$ is defined as the ratio between the circumference and the diameter of a circle. In other words, for every circle, we have

$\pi=\dfrac{C}{d}=\dfrac{C}{2r}$

Since the diameter is twice the radius.

Solving for the circumference, we have

$C=2\pi r$

So, in your case, the answer is

$C=16\pi$

Answer 2

Answer:

50.24

Step-by-step explanation:

1. Formula = 2πr
2. 2 × 3.14 = 6.28
3. 6.28 × r (8) = 50.24