Question

9. Find
(i) the lateral or curved surface ar
4.2 m in diameter and 4.5 m high.
urved surface area of a closed cylindrical petrol storage tank that is
of the steel actually used was wasted in
(ii) how much steel was actually use
making the tank.
ch steel was actually used, if
12​

Answer 1

Answer:

1.diamitar= 4.2m

radius=2.1m

night=4.5m

Step-by-step explanation:

1.CSA of cylindrical petrol tank=2πrh

= 2×22/7×2.1×4.5

=44×0.3×4.5

59.4m2

2.area of shet be x m

waste sheet x of 1/12

used remaining sheet=x-x/12

=11x/12

=x=12/11

total surface area of cylindrical tank

=2πr(r+h)

2×22/7×2.1(2.1+4.5)

44×0.3×66

87.12 m2

using area of sheet=12/11×87.12

=12×79.2

=95.04 m2