Which of the following is a plane figure?

Identify the wrong statement of the following:

The number of edges of a cube are

The total surface area of a cube of side a is

If the edges of a cuboid are l, b and h respectively, then the total surface area of the cuboid is

The lateral surface area of a cuboid of length l, breadth b and height h is

The side of a cube is 1 cm. The total surface area of the figure formed by joining two such cubes is

A brick measures 25 cm \(\times\) 12 cm \(\times\) 10 cm. Its surface area is

The area of the four walls of a room is 300 m². Its length and height are 15 m and 6 m respectively. Find its breadth. 

The area of the four walls of a room is 80 cm² and its height is 4 m. Then, the perimeter of the floor of the room is

The edge of a cube is 10.5 mm. Find its total surface area in cm². 

The surface area of a cuboid is 1372 cm².If its dimensions are in the ratio 4: 2: 1, find its length.

The floor of a rectangular hall has a perimeter of 250 m and its length and breadth are in the ratio of 13: 12. If the cost of painting the four walls and ceiling at the rate of Rs. 5 per m² is Rs.27000, find the height of the hall.

A right circular cylinder is 3 m high and the circumference of its base is 22 m.Find its curved surface area.

A metal pipe is 77 cm long.The inner diameter of a cross-section is 4 cm and outer diameter is 5.0 cm.Find its
(i) Inner curved surface area
(ii) Outer curved surface area

How many cylindrical glasses of 3 cm base radius and height 8 cm can be refilled from a cylindrical vessel of base radius 15 cm which is filled upto a height of 32 cm?

A hemispherical bowl has a radius of 3.5 cm. What would be the volume of water it would contain?

A small indoor greenhouse (her-barium) is made entirely of glass panes (including base) held together with tape. It is 30 cm long, 25 cm wide and 25 cm high.
(i) What is the area of the glass?
(ii) How much of tape is needed for all the 12 edges?

A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find its.
(i) inner curved surface area,
(ii) outer curved surface area,
(iii) total surface area.

The students of a Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?

A joker's cap is in the form of a right circular cone of base radius 7 cm and height 24 cm. Find the area of the sheet required to make 10 such caps.

A right circular cylinder just encloses a sphere of radius r. Find
(i) surface area of the sphere,
(ii) curved surface area of the cylinder,
(iii) ratio of the areas obtained in (i) and (ii).

A well with 10 m inside diameter 10 m deep. Earth taken out of it is spread all around it to a width of 5 m to form an embankment. Find the height of the embankment.