Question

The circumference of a circle with a diameter of 2 units is ________.

• A. $\pi$ units
• B. 2$\pi$ units
• C. 4$\pi$ units
• D. 8$\pi$ units

Answer 1

The correct option is B 2$\pi$ units

$\text{Circumference of a circle}=2\pi \times \text{radius}$
But, $2\times \text{radius}=\text{diameter}$
$⟹\text{Circumference}=\pi \times \text{diameter}$
Since diameter is 2 units, we have circumference to be 2$\pi$ units.