The radius of the base of a Conical tent is 12 m. The tent is 9 m high. Find the cost of canvas required to make the tent, if one square metre of canvas costs Rs 120
(Take `pi = 3.14`)

Options

A. Rs 67,830
B. Rs 67,800
C. Rs 67,820
D. Rs 67,824

Answer

D

Explanation

तंबू की तिरछी ऊँचाई
=`sqrt(9^2+12^2)`=`sqrt(225)`
15m
`therefore` तंबू का वक्र पृष्ठ क्षेत्रफल= `pi`rl
`=3.14 xx 12 xx 15`
`=180 xx 3.14`
`therefore`. कैनवास की कुल लागत `=120xx 180xx 3.14`
`=12xx18xx3.14`
Rs. 67,824