Question

The circle A has a radius 2 cm. If the new radius of the circle A is twice the old radius. Then what is the new diameter of the circle?

• A. 16 cm
• B. 4 cm
• C. 6 cm
• D. 8 cm

Answer 1

The correct option is D 8 cm

The old radius of the circle A is2 cm. The new radius is twice the old radius. So the new radius will be two times the old radius.
That is, 2 x 2 cm = 4 cm
Diameter = 2 $\times$radius
= 2 $\times 4$
= 8 cm