Скачать или смотреть Chapter 13 Surface Areas and Volumes Exercise 13.2 | Class 9 Maths NCERT Question Answer

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✅ In this video,
✔️ Class: 9th
✔️ Subject: Maths
✔️ Chapter: 13- Surface Areas and Volumes
✔️ Topic Name: Exercise 13.2

✔️ कक्षा: 9वीं
✔️ विषय: गणित
✔️ अध्याय: 13- पृष्ठ क्षेत्रफल और आयतन
✔️ विषय का नाम: अभ्यास 13.2

✔ kaksha: 9veen
✔ vishay: ganit
✔ adhyaay: 13- prishth kshetrafal aur aayatan
✔ vishay ka naam: abhyaas 13.2

Question Covered :-
1. The curved surface area of a right circular cylinder of height 14 cm is 88 cm2. Find the diameter of the base of the cylinder. 2. It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same? 3. A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm (see Fig. 13.11). Find its(i) inner curved surface area,(ii) outer curved surface area,(iii) total surface area. 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 m2. 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 ₹12.50 per m2. 6. Curved surface area of a right circular cylinder is 4.4 m2. If the radius of the base of the cylinder is 0.7 m, find its height. 7. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find (i) its inner curved surface area,(ii) the cost of plastering this curved surface at the rate of ₹40 per m2. 8. In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system. 9. Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.(ii) how much steel was actually used, if 1/12 of the steel actually used was wasted in making the tank. 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. 11. 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?

1. 14 semee oonchaee vaale ek lambavrtteey belan ka vakr prshtheey kshetraphal 88 semee2 hai. belan ke aadhaar ka vyaas gyaat keejie. 2. ek dhaatu kee sheet se 1 meetar oonchaee aur 140 semee aadhaar vyaas vaala ek band belanaakaar taink banaana hai. isake lie kitane varg meetar sheet kee aavashyakata hogee? 3. ek dhaatu ka paip 77 semee lamba hai. ek anuprasth kaat ka aantarik vyaas 4 semee aur baaharee vyaas 4.4 semee hai (dekhie aakrti 13.11). isaka (i) aantarik vakr prshtheey kshetraphal, (ii) baaharee vakr prshtheey kshetraphal, (iii) kul prshtheey kshetraphal gyaat keejie. 4. ek rolar ka vyaas 84 semee hai aur isakee lambaee 120 semee hai. ek khel ke maidaan ko samatal karane ke lie ise ek baar ghoomane mein 500 poorn chakkar lagate hain. khel ke maidaan ka kshetraphal varg meetar mein gyaat keejie. 5. ek belanaakaar stambh 50 semee vyaas aur 3.5 meetar ooncha hai. 12.50 rupaye prati varg meetar kee dar se stambh kee vakr satah ko rangane kee laagat gyaat keejie. 6. ek lamb vrtteey belan ka vakr satah kshetraphal 4.4 meetara2 hai. yadi belan ke aadhaar kee trijya 0.7 meetar hai, to isakee oonchaee gyaat keejie. 7. ek vrtteey kuen ka aantarik vyaas 3.5 meetar hai. yah 10 meetar gahara hai. (i) isaka aantarik vakr satah kshetraphal gyaat keejie, (ii) 40 rupaye prati varg meetar