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

Radius of a circle is 3.05 cm, then diameter =....cm.

If the radius of the base of the cylinder is 2.8 cm and its height to 5.5 cm, then find its Curved surface area

If the radius of the base of the cylinder is 2.8 cm and its height to 5.5 cm, then find its Total surface area

The curved surface area of a cylinder is 440 cm^2 and its radius is 5 cm. Find its height.

In a right circular cone, if perpendicular height is 12 cm and radius is 5 cm, then find its slant height.

Area of base of a cylinder is 100 cm^2 . Its height is 5 cm . Find its volume.

Sides of a triangle are 45 cm, 39 cm and 42 cm, find its area.