Maths
1. Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.
17
Oct
1. Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area. 1. Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area. October 17, 2020 Category: Chapter 13 - Surface Areas [...]
11. The students of 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?
17
Oct
11. The students of 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, [...]
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11. The students of Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base ,
how much cardboard was required to be bought for the competition? ,
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 ,
10. 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.
17
Oct
10. 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 [...]
9. Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5m high. (ii) How much steel was actually used, if 1/12 of the steel actually used was wasted in making the tank.
17
Oct
9. Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5m high. (ii) How much steel was actually used, if 1/12 of the steel actually used was wasted in making the tank. 9. Find (i) the lateral or curved surface area of [...]
8. In a hot water heating system, there is cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system.
17
Oct
8. In a hot water heating system, there is cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system. 8. In a hot water heating system there is cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system. October [...]
7. The inner diameter of a circular well is 3.5m. It is 10m deep. Find (i) its inner curved surface area, (ii) the cost of plastering this curved surface at the rate of Rs. 40 per m^2.
17
Oct
7. The inner diameter of a circular well is 3.5m. It is 10m deep. Find (i) its inner curved surface area, (ii) the cost of plastering this curved surface at the rate of Rs. 40 per m^2. (ii) the cost of plastering this curved surface at the rate of Rs. 40 per m^2. 7. The [...]
6. Curved surface area of a right circular cylinder is 4.4 m^2. If the radius of the base of the base of the cylinder is 0.7 m, find its height.
17
Oct
6. Curved surface area of a right circular cylinder is 4.4 m^2. If the radius of the base of the base of the cylinder is 0.7 m, find its height. 6. Curved surface area of a right circular cylinder is 4.4 m^2. If the radius of the base of the base of the cylinder is [...]
5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs. 12.50 per m^2.
17
Oct
5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs. 12.50 per m^2. 5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface [...]
4. The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m^2?
17
Oct
4. The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m^2? 4. The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete [...]
3. A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4cm. (see fig. 13.11). Find its (i) inner curved surface area, (ii) outer curved surface area (iii) total surface area
17
Oct
3. A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4cm. (see fig. 13.11). Find its (i) inner curved surface area, (ii) outer curved surface area (iii) total surface area (ii) outer curved surface area (iii) total surface area 3. A metal pipe [...]