What is the circumference of a circle whose radius is 10.5 cm?

21 cm 66 cm 30 cm 110 cm

66 cm

Concept Used Circumference of circle = 2\(\Pi \)r, where r = radius Calculation Circumference = 2 x \(\frac{22}{7}\) x 10.5 = 66 cm Therefore, Circumference of circle is 66 cm.