Answer :

Given.


Radius of conical tent is 4 m


Slant height of conical tent is 5m


Formula used/Theory.


CSA of cone = πrl


As the conical tent is not on ground


only CSA is required to construct the tent


CSA of conical tents = 3.14 × 5 × 4


= 62.8 m2


Let length of cloth be x cm


Area of Cloth = 1.25 × x m2


If 12 tents are to be constructed


Then area of cloth required to make 12 conical tents is


12 × 62.8 m2


= 753.6 m2


1.25 m × x m = 753.6 m2


x = = 602.88 m


If 1m length of canvas cost Rs. 20


Then 602.88 m length of canvas cost Rs. 20 × 602.88


= Rs. 12056.7


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