Question

Suppose the diameter of a circle is \color{green}{6}6start color green, 6, end color green units. What is its circumference?

Answer 1

Given,

The diameter of the circle is 6 units,

So, the radius of the circle is,

$r=\frac{diameter}{2}=\frac{6}{2}=3\text{ units}$

Thus, the circumference of the circle is,

$C=2\pi r$

   $=2\pi (3)$

   $=6\pi$

   $\approx 18.85$

Hence, circumference is $6\pi$ units or 18.85 units ( approx)