A polygon has 9 sides, what is its interior angle?

The area of the base of a right circular cone is 400π and its height is 15 cm. The curved surface of the cone ( in cm²) is:

The lengths of the parallel sides of a trapezium are 51 cm and 21 cm, and that of each of the other two sides is 39 cm. what is the area ( in cm²) of the trapezium?

The ratio of the volume of right circular cylinder and a right circular cone of the same base and height will be:

A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm²) in the total surface area?

The area of a triangle is 24 square cm. If one side of it is 4 cm, what will be the height of the triangle?

A corner of a cube of side length 8 m. When cut by a plane which bisects the sides of the cube, we get a pyramid whose volume is : 

The total surface area of a hemisphere is 166.32 sq cm, find its radius?