A solid frustum is of height 8 cm. If the radii of its lower and upper ends are 3 cm and 9 cm respectively, then its slant height is
(a) 15 cm        
(b) 12 cm       
(c) 10 cm        
(d) 17 cm

If the height and slant height of a cone are 21cm and 28cm respectively. Find its volume.

A bucket is in the form of a frustum of a cone and holds 28.490 litres of water. The radii of the top and bottom are 28 cm and 21 cm respectively. Find the height of the bucket. (a) 15 cm (b) 20 cm (c) 25 cm (d) 30 cm

The radii of the circular ends of a frustum are 6 cm and 14 cm. If its slant height is 10 cm, then its vertical height is (a) 6 cm (b) 8 cm (c) 4 cm (d) 7 cm

The height and slant height of a cone are 12 cm and 13 cm respectively. Find its volume.

If the base radius and height of a right circular cone are 3cm and 4cm in lengths, then the slant height is (a) 5cm (b) 2cm (c) 25cm (d) 6cm

A container is in the form of a frustum of a cone of height 30 cm with radii of its lower and upper ends as 10 cm and 20 cm respectively. Find the capacity and surface area of the container. Also, find the cost of milk which can completely fill the container at the rate of Rs 25 per litre.[Take pi= 3.14 ]

An open metal bucket is in the shape of a frustum of a cone of height 21 cm with radii of its lower and upper ends as 10 cm and 20 cm respectively. Find the cost of milk which can completely fill the bucket at Rs. 30 per litre.

Find the volume of a right circular cylinder, if the radius (r) of its base and height (h) are 7cm and 15cm respectively.

Find the volume of a right circular cylinder, if the radius (r) of its base and height (h) are 7cm and 15cm respectively.

A container, opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs 20 per litre.