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
- A solid cylinder has a total surface area of 462 cm². Its curved surface area is one-third of its total surface area. Find its volume.
- If the surface area of a sphere is 4πr², and it is cut into four equal parts through the center, find the total surface area of all four parts.
- A solid cylinder has a total surface area of 462 sq. cm. Its curved surface area is one-third of its total surface area. Find the radius of the cylinder.
- If the radius of the base of a cone is halved, keeping the height same, what is the ratio of the volume of the reduced cone to that of the original cone?
- A cylinder has a radius of 10 cm and height of 20 cm. If the height is doubled and radius is halved, the new CSA will be: