A heap of paddy is in the form of a right circular cone whose diameter is 4.2 m and height 2.8 m if the heap is to be covered exactly by a canvas to protect it from rain the find the area of the canvas neede.

# A heap of paddy is in the form of a right circular cone whose diameter is 4.2 m and height 2.8 m if the heap is to be covered exactly by a canvas to protect it from rain the find the area of the canvas neede.

1. A
23.1
2. B
78.2
3. C
98.2
4. D
88.5

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### Solution:

Required area of canvas is equal to curved surface area of cone.
diameter = 4.2 m, radius  = 2.1 m, height = 2.8 m  Let be the slant height of cone
Curved surface area of cone = Hence option (1) is correct.

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