What is the central angle of the sector to be used to make a cone of base radius`sqrt 2` centimetres and height 4 centimeters?

What is the area of the sector with central angle 120^@ ?

Find the volume of right circular cylinder of base radius r and height 2r .

What is the perimeter of a sector of a circle whose central angle is 90^(@) and radius is 7 cm ?

What is the perimeter of the sector with radius of 10.5 cm and sector angle 60^(@) ?

A hollow sphere of internal and external radii are 6 cm and 8 cm respectively is melted and recast into small cones of base radius 2 cm and height 8 cm . Find the number of cones .

A hollow sphere of internal and external radii 2 cm and 4 cm respectively is melted into a cone of base radius 4 cm. find the height and the slant height of the cone.

A right circular cone 3.6 cm high with base radius 1.6 cm is melted and recast into another cone of base radius 1.2 cm. then its height is

The bottom of a right cylindrical shaped vessel made from metallic sheet is closed by a cone shaped vessel as shown in the figure . The radius of the circular base of the cylinder and radius of the circular base of the cone each os equal to 7 cm . If the height of the cylinder is 20 cm and height of cone is 3 cm calculate the cost of milk to fill completely this vessel at the rate of Rs. 20 per litre.

The perimeter of sector of a circle of radius 7cm and central angle 45^@ is