Mensurationmedium · Past Paper
A cylinder has a base radius of 7 cm and a total surface area of 748 cm². Find its height.
A10 cm
B8 cm
C12 cm
D15 cm
✓ Correct Answer: A — 10 cm
2πr(r+h) = 748 => 2 * (22/7) * 7 * (7+h) = 748 => 44(7+h) = 748 => 7+h = 17 => h = 10 cm.
Share this question
More from Mensuration
- The diameter of a copper sphere is 18 cm. It is drawn into a wire of diameter 4 mm. Find the length of the wire.
- The base area of a cylinder is 100 cm^2 and its volume is 500 cm^3. Find its height.
- Find the area of a trapezium whose parallel sides are 10 cm and 22 cm, and non-parallel sides are 10 cm each.
- How many square tiles of side 2 cm are needed to cover a square floor of side 10 cm?
- The diagonal of a square is 10 cm. What is its area?