The central angle of a circle is divided in the ratio `2:3` to form two sectors. Two cones are made by rolling up the two sectors.What is the ratio between the curved surface areas.

The central angle of a circle is divided in the ratio 2:3 to form two sectors. Two cones are made by rolling up the two sectors.Find out the ratio between the base perimeters of the cones.

The diameter of two sphere are in the ratio 1:2 , what is the ratio between their total surface area.

Prove that for a cone made by rolling up a semicircle, the curved surface area is twice the base area.

Two nuclei have mass numbers in the ratio 1:8. What is the ratio of their nuclear radii?

Two nuclei have mass numbers in the ratio 1:64. What is the ratio of their nuclear radii?

The volumes of two spheres are in the ratio '27: 64 .' What is the ratio of their radii? And the ratio of their surface areas?

The ratio of the diameters of two cylinders is 1: 2 and the ratio of the length is 3: 1 . What is the ratio of their volumes?