From a circle of radius a, a sector, which subtend an angle π/5 at the centre has been cut off. The perimeter of the remaining part of the circle is

A semicircle is folded to make a cone. Find the height (in cm) of the cone if diameter of the semicircle is 28 cm?

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:

From a right cone of height h and with base radius r a cone has been cut of from the centre of the height. The volume of remaining frustum of the cone is.

One side of the rectangular ground is 8m and its diagonal is 17m. Find the area of the ground?

A regular hexagon has a side of 4 cm. Find its area. (in sq. cm)

A polygon has 14 sides then find out No. of diagonals in that polygon. 

The area  of a circle is 616 sq cm, find its circumference?