If the radius of a cylinder is doubled keeping its lateral surface area the same, then what is its height ?

Lateral surface area of a cube is given by

The radius of a circle is doubled then its area becomes ……………….. Times.

Total surface area of a cylinder is

If each edge of a cube is doubled. How many times will its surface area increase?

The lateral surface area of a cylinder is equal to the curved surface area of a cone. If their base be the same, find the ratio of the height of the cylinder to slant height of the cone.

If the radius of base of a cylinder is doubled and the height remains unchanged, its C.S.A becomes