Question

Match the following circle with the given radius with their circumference.

• A. 44 cm
• B. 22 cm
• C. 66 cm
• D. 110 cm

Answer 1

Circumference of a circle $=2\pi r$

For radius = 7 cm
$\text{Circumference}=2\times \frac{22}{7}\times 7=44cm$

For radius = 3.5 cm $\text{Circumference}=2\times \frac{22}{7}\times 3.5=22cm$

For radius = 10.5 cm
$\text{Circumference}=2\times \frac{22}{7}\times 10.5=66cm$

For radius = 17.5 cm
$\text{Circumference}=2\times \frac{22}{7}\times 17.5=110cm$