Question

A circle has a radius of $7cm.$ What is the nature of the value of its circumference?

• A. Rational
• B. Irrational
• C. Whole number
• D. Integer

Answer 1

The correct option is B

Irrational

$2\pi r$ is the formula for the calculation of circumference, where $r$ is the radius of the circle. Here, $\pi$, which is irrational is getting multiplied with $2r$, which is rational, thus, the resultant number is an irrational number. Hence, the value of circumference is irrational.