Question

D. How many metres of cloth 1 m 10 cm wide
will be required to make a circus tent in the
form of a cone which is 12 m high and the
radius of whose base is 10 m ? Also determine
the cost of the cloth at 7 per m​

Answer 1

Answer:

Length of Cloth=1.1m

Height of conical circus tent=12m

Radius of base=10m

Cost of cloth=7/metre

Now for the cylinder l=(12^2+10^2)^(1/2)

l=15.62

Curved surface area of cylinder= pi*r*l = 490.72

Area of cloth=(1.1*1.1) = 1.21

Cloths required =490.72/1.21 = approx 406

total cost = 406*7 =2842 rupees