Question

If the radius of a circle is doubled, what happens to its circumference?

• A. It get quadrupled
• B. It gets doubled
• C. It gets halved
• D. It remains the same

Answer 1

The correct option is B It gets doubled

Circumference of a circle = 2$\pi$R

If the radius is doubled, then the new radius will be 2R
and the new circumference of the circle = 2$\pi$(2R) = 4$\pi$R

Which is double of the original circumference.