Find the area of the rhombuś of side 5 centimetres and a diagonal 6 centimetres.

What is the area of a rectangle of length 5 centimetres and breadth 3 centimetres?

What is the area of a rectangle of length 8 centimetres and breadth 2 centimetres?

What is the surface area of a cone of base diameter 30 centimetres and height 40 centimetres?

The perimeter of a rectangle is 42 centimetres and its diảgonal is 15 centimetres. Find the dimensions of the rectangle:

A solid metal sphere of radius 6 centimetres is melted and recast into solid cones of radius 6 centimetres and height 6 centimetres. Find the number of cones. .

The base diameter of a metallic cylinder is 18 centimetres and its helght 24 centimetres. It is melted and recast into cylinders of base diameter 12 centimetres and height 6 centimetres. How many such small cylinders are got?