A circular hole of 4 cms diameter and 12cms deep in a metal block is rebored to increa.the diameter to `4.12 cm`. then the amountsmetal approximately removed is

A circular hole of 4cms diameter and 12cms deep in a metal block is rebored to increa.the diameter to 4.12cm .then the amountsmetal approximately removed is

A circular hole of 4 mm in diameter and 12 mm deep in a metal block is rebored to increase the diameter to 4.12 mm, then the amount of metal removed is approximately

A solid metal sphere of 6 cm diameter is melted and a circular sheet of thickness 1 cm is prepared. Determine the diameter of the sheet.

A solid metal sphere of 6 cm diameter is melted and a circular sheet of thickness 1 cm is prepared. Determine the diameter of the sheet.

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

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