A copper block length `5 cm`, breadth `4 cm` and thickness `2 cm` is melted and made into a cylindrical rod of radius `2 mm`. What is the length of the rod?

Radius of curvature of a concave mirror is 24 cm. Then find the focal length of the mirror ?

perimeter of a rectangle is 40 cm. What is its length + breadth = _______

If a square is inscribed in a circle of diameter 4 cm, what will be the length of a side of the square?

A metallic sphere of radius '4 cm' is melted and recast. How many small spheres of radius '1 cm' will get from it?

A man wants to cut three length from a single piece of board of length 91 cm. The second length is to be 3 cm longer than the shortest and the third length is to be twice as long as the shortest.What are the possible lengths of the shortest board if the third piece is to be at least 5 cm longer than the second.?

In a circle two parallel chords of lengths 4 cm and 6 cm are 5 cm apart. What is the radius of the circle?

The length of a rod is 56 centimetres. It is bent into a rectangle.What is the sum of length and breadth of the rectangle?