Mensurationeasy · Past Paper
The surface area of a sphere is 'S'. If its radius is tripled, the new surface area is:
A3S
B6S
C9S
D27S
✓ Correct Answer: C — 9S
S ∝ r². Tripling r results in (3)² = 9 times the area.
Share this question
More from Mensuration
- A right circular cone is 3.6 cm high and its base radius is 1.6 cm. It is melted and recast into a right circular cone with base radius 1.2 cm. Find its height.
- Area of a quadrant of circle is 154 sq. cm. Find its radius.
- A cuboidal block of wood measures 4 cm by 6 cm by 8 cm. What is its volume?
- A square park has side 20m. A path of 1m width is built inside it. Area of path is:
- A room is 10 m long, 8 m wide and 4 m high. Find the cost of painting its four walls at Rs. 10 per sq. m.