Question

Find the circumference of a circle whose diameter is 21 units.

• A. 33 units
• B. 66 units
• C. 90 units
• D. 45 units

Answer 1

The correct option is B 66 units

Given:
Diameter of the circle (D) = 21 units

We know:
Circumference of the circle
$=\pi \times \text{D}=\pi \times 21=\frac{22}{7}\times 21=22\times 3=66\text{units}$

Hence, the circumference of the circle is 66 units.