Under NCC training program, students of Vidyalaya stayed in a conical tent made, with a base radius of 7 m and slant height 25 m. After performing the whole day program of NCC, students came to their tent for some rest and enjoyment. At the same time the NCC master came and asked each student to calculate the amount of canvas used to make this tent, assuming that all the stitching margins and the wastage is negligible. What is the area of canvas used in making the tent?

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550 m

2

570 m

2

590 m

2

580 m

2

answer is D.

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Detailed Solution

Given,

r = 7

l = 25

m.
The area of the canvas = curved surface area of the conical tent.
CSA

= π r l

Area = 227 × 7 × 25

Area

= 550

2

Hence, the canvas required for making each tent is 550 m

2

.
Therefore, the correct option is 4.

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