In Fig.13.12, you see the frame of a lampshade. It is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade.

In the given you see, the frame of a lampshede. It is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade.

From the top of a cone of base radius 12 cm and height 20 cm. a small cone of base radius 3cm is to be cut off. How far down the vertex is the cuts should be made ? Find the volume of the frustum so obtained .

The students of a Vidyalya were asked to participate in a competition for maiking and decorating pen holders in the shape of a cylinder with a base, using carboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Vidhaly was to supply the competittors with cardboard. If there were 35 competitiors, how much carboard was required to be bought for the competition ?

The rainwater from a roof of dimensions 22xx20m drains into a cylinderical vessel having diameter of base 2 m and height 3.5 m. if the rain-water from the roof just fills the cylinder vessel, find the rainfall in cm.

An oil funnel made of tin sheet consists of a 10 cm long cylindrical portion attached to a frustum of a cone. If the total height is 22 cm, diameter of the cylindrical portion is 8 cm and the diameter of the top of the funnel is 18 cm, find the area of the tin sheet required to make the funnel (see Fig ).

A corn cob shaped like a cone, has the radius of its broadest end as 1.4 cm and length (height) as 12 cm. If each 1cm^(2) of the surface of the cob carries an average of four grains, find how many grains approximately you would find on the entire cob.

A flooring tile has the shape of a parallelogram whose base is 24 cm and the corresponding height is 10 cm.How many such tiles are required to cover a floor of area 1080 m^2 ?[If required you can split the tiles in whatever way you want to fill up the corners]

From the top of a solid cone of height 12 cm and base radius 6 cm, a cone of height 4 cm is removed by a plane parallel to the base of the original cone. Find the total surface area of the remaining solid. [use pi=3.14,sqrt(5)=2.236 ]

A cylinderical container of diameter 12 cm and height 15 cm is filled with ice cream. The whole ice cream has to be distributed to 10 children in equal cones with hemispherical tops. If the height of the conical portion is four times the radius of its base, find the radius of the ice cream cone.