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

In the given figure if each of the outer circles have radii ‘R’, then the radius of the inner circle will be:

Find the area of triangle whose medians are 8 cm, 15 cm and 17 cm respectively?

What is total surface area of a cone where, r’ is radius and ‘l’ is slant height?   

A shuttlecock used of playing badminton has the shape of a frustum of a cone mounted on a semi sphere. The external diameters of the frustum are 5 cm and 2 cm, the height of the entire shuttlecock is 7 cm. The external surface is of the shuttlecock is:

A solid metallic cylinder of base radius 3 cm. and height 5 cm. is melted to form cones, each of height 1 cm. and base radius 1 mm. The number of cones is -