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381. The four of a rectangular hall has a perimeter 110 m. If the cost of painting the four walls at the rate of र 10 per m² in र 13200, find the height of the hall.

Solution not provided.

Ans. 12 m

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382. How many meters of cloth 4 cm wide, will be required to make a conical tent, the radius of whose base is 600 cm and height is 8 cm (Use π = 3.14).

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383.

3 over 4

th of a cylindrical can contains milk. The height of the can is 1.4 m and radius is 0.4 m. This milk is poured into small cylindrical glasses of height 10 cm and radius 5 cm. How many small glasses are needed to empty the can?

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384. So circular plates, each of radius 7 cm and thick ness

1 half

cm are placed one above another to form a solid right circular cylinder. Find the total surface area and the volume of the cylinder so formed.

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385.

A hemispherical bowl made of brass has inner radius 10.5 cm. Find the cost of polishing it on the inside at the rate of र 0.12 per sq. cm.

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386. The curved surface area and volume of a pillar are 264 m² and 396 m³respectively. Find the diameter and height of the pillar.

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387. Find the volume of a cylindrical tank of height 1.4 m and circumference of base is 2π m.

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388. A joker’s cap is in the form of a right circular cone of base radius 7 cm are height 24 cm. Find the area of sheet required to make 20 such caps.

open parentheses Take space straight pi equals 22 over 7 close parentheses

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389. A river 3 m deep and 40 m wide is fllowing at the rate of 2 km/hour. How much water will fall into the sea in 2 minutes.

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390.

A hollow right circular cylindrical copper pipe is 21 cm long. Its outer and inner diameters are 10 cm and 6 cm respectively. Find the volume of copper used in making the pipe.

$open parentheses Use space straight pi equals 22 over 7 close parentheses$ .