Mensurationmedium · Past Paper
Two spheres have surface areas in the ratio 16:25. What is the ratio of their radii?
A4:5
B16:25
C2:5
D256:625
✓ Correct Answer: A — 4:5
A1/A2 = (r1/r2)² => 16/25 = (r1/r2)² => r1/r2 = sqrt(16/25) = 4/5.
Share this question
More from Mensuration
- The radius of a sphere is 21 cm. Find its surface area.
- What is the volume of a right circular cone whose lateral surface area is 120 cm² and base radius is 6 cm?
- The radius and height of a cone are in the ratio 3:4. If its curved surface area is 188.4 cm², find its radius (Take π = 3.14).
- What is the area of a semi-circle with a radius of 14 cm? (Take pi = 22/7)
- What is the area of a rhombus whose diagonals are 16 cm and 12 cm?