If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

The outer diameter of a spheircal shell is 10 cm and the inner diameter is 9 cm. find the volume of the metal contained in the shell.

A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find outer curved surface area.

A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find total surface area.

A piece of metal pipe is 77 cm long, the inside diameter of a cross-section is 4 cm and the outside diameter is 4.5 cm. If the metal weighs 8 g per cm^3 , what is the weight of piece of pipe ?

A metal pipe is 77 cm long. The inner diameter of a cross - section is 4 cm, the outer diameter being 4 . 4 cm (see figure) . Find its outer curved surface area

A metal pipe is 77 cm long. The inner diameter of a cross - section is 4 cm, the outer diameter being 4 . 4 cm (see figure) . Find its total surface area

A spherical glass vessel has a cylindrical neck 8 cm long, 2 cm in diameter, the diameter of the spherical part is 8.5 cm. By measuring the amount of water it holds, a child finds its volume to be 345 cm^3 . Check whether she is correct, taking the above as the inside measurements, and pi = 3.14.

The focus of a parabolic mirror as shown in the figure is at a distance of 5 cm from its vertex. If the mirror is 45 cm deep, find the distance AB.

A metal pipe is 77 cm long. The inner diameter of a cross section is 4cm, the outer diameter being 4.4 cm [See Fig. ]. Find its inner curved surface area.