Question

Find the circumference of the circle of radius 5 cm.

Answer 1

Hint: The radius r of the circle is the distance from its centre to any point on the circle. The formula for circumference is given by- ${\text{C}} = 2\pi r$

Complete step-by-step solution -
It is given that the radius of the circle is 5 cm. The value of $\pi $ is approximately 3.14. It is the ratio of the circumference and the diameter of the circle. Radius is the fixed distance b/w centre and any point at the circle.

The circumference of the circle is-
$
  {\text{C}} = 2\pi r\\
  {\text{C}} = 2 \times 3.14 \times 5 = 31.4\;cm\; \\
$
This is the required answer.

Note: The most common mistake is that students forget to write the units in the final answer. The circumference is a length of the outer perimeter of the circle, so its units are the same as length. In this case, it is cm.