A pillar 42cm in diameter is 15 m high. How much material (in cm³) was used to construct it?$$(Take \pi = \frac{22}{7})$$​​

A square tank holds 15,000 litres of water. If its depth is 2.5 m, find the length of one side of its base.

A triangle ABC with sides 3 cm, 4 cm and 5 cm is revolved about the side 3 cm. Find the volume of the solid so obtained. (Use π = 3.14)

If the areas of three adjacent faces of a cuboid are x, y, z square units, respectively, then the volume of the cuboid is:

A cylindrical water tank has a base radius of 7 m and a height of 10 m. Water is filled into the tank at a constant rate. After filling the tank completely, 5% of the water leaks out due to a crack at the bottom. The remaining water is transferred into another cylindrical tank whose base radius is 5 m. Find the height of water in the second tank.

A cube is painted on all faces and then cut into 27 smaller cubes of equal sizes. How many smaller cubes have exactly two faces painted ?

A solid is in the shape of a cone mounted on a hemisphere. The radius of each is 6 cm and the total height of the solid is 14 cm . Find the surface area of the solid.

A solid cube of 4 inches has been painted red, green and black on pair of opposite faces. It has been cut into one inch cubes. How many cubes will have only two faces painted?

From a cuboid of dimension 10cm×5cm×2.5cm, small cubes of edge 2.5 cm are cut. How many small cubes are formed from the cuboid?

The total surface area of a hemisphere is 4,158 $$m^2$$​. If the radius of the hemisphere becomes one-third of itself, then what will be the new curved surface area of the hemisphere? (Use π=22/7 )

If the volume of a cone is 48π $$cm^3$$​ and the height is 10 cm . Find the radius of its base in nearest one decimal place.