Mensurationeasy · Past Paper
The area of a circle is 154 sq. cm. What is its radius?
A14 cm
B7 cm
C21 cm
D3.5 cm
✓ Correct Answer: B — 7 cm
Area = pi * r^2. 154 = (22/7) * r^2. r^2 = 49, so r = 7 cm.
Share this question
More from Mensuration
- Find the lateral surface area of a cuboid with dimensions 10 cm x 8 cm x 5 cm.
- If the side of a cube is 1.2 m, its volume is:
- The volume of a sphere is doubled. What is the ratio of the new radius to the old radius?
- A vessel is in the form of a hollow hemisphere. If the internal radius is 7 cm, find its internal capacity.
- A solid is in the form of a cylinder with hemispherical ends. The total height of the solid is 19 cm and the diameter of the cylinder is 7 cm. Find the volume of the solid.