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The vertical height of a right circular conical tent is 4m and the volume of space inside it is 138*2/7 m³ . fine the canvas required to make the tent .

also , find the cost of canvas at the rate of Rs 120 per m²


H=4 m
v= \frac{1}{3}  \pi  r^{2} h=138* \frac{2}{7}  \\  \\ 
 \frac{1}{3}  \pi r ^{2} *4=39.42 \\  \\ 
r ^{2} =9.41
r=3.06 \\  \\ 

csa of the tent=πrl
csa= π*3.06*5.04=48.45 m²
cost for m²=120
cost for 48.45m²=120*48.45=5814 rs

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