Find i) The curved surface area of a closed cylindrical petrol storage
tank that is 4.2m in diameter and 4.5m high.
ii) how much steel was actually used,if 1/12of steel actually wasted making tank
Answers
Answered by
33
EXPLANATION.
Height of the cylinder = 4.5 m.
Diameter of a cylinder = 4.2 m.
Radius of a cylinder = 4.2/2 = 2.1 m.
(ii) = How much steel was actually used
if 1/12 of steel actually wasted making
tank.
Total surface area of tank = 2πr ( r + h).
= 2 X 22/7 X 2.1 ( 2.1 + 4.5 ).
= 2 X 22/7 X 21/10 ( 6.6).
= 22 X 3 X 6.6 / 5.
= 435.6 / 5.
= 87.12 m².
amount of steal used in making tank = x.
Wasted steel = x/12.
T.S.A Of steel = Amount of steal required -
Amount of steal wasted.
→ x - x/12 = 87.12
→ 12x - x / 12 = 87.12
→ 11x / 12 = 87.12
→ 11x = 87.12 X 12
→ 11x = 1045.44
→ x = 95.04 m².
Answered by
5
Answer:
curved surface area= 59.4msq
total surface area=87.12msq
Step-by-step explanation:
putting all the values,we get
= curved surface area=2 py rh
=2*22/7*4.2*4.5
=59.4msq
total surface area =2pyr(r+h)
=2*22/7*4.2(4.2+4.5)
=87.12msq
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