Find
O the lateral or curved surface area of a closed cylindrical petrol storage tank that is
42 m in diameter and 4.5 m high.
m how much steel was actually used, if of the steel actually used was wasted in
making the tank
12
Answers
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12
Answer:
Given :
diameter = 4.2m
radius = 1/2d
= 1/2 × 4.2
= 2.1 m
height =4.5m
To Find : CSA of closed cylindrical petrol stroge tank and how much steel used
Explanation:
Procedure :
CSA = 2 × 22/7 × r × h
= 2 × 22/7 × 2.1 × 4.5
= 59.4 m^2
TSA = 2 × 22/7 × r ( r + h )
= 2 × 22/7 × 2.1 ( 2.1 + 4.5 )
= 44 × 0.3 × 6.6
= 87.12 m^2
Let actual area of the steel used = x m^2
( 1/12 of x ) steel was wasted .
area of steel that wasted = 1/12 × x
= x/12 m^2
area of steel used = x - x/12
= 11x/12 m^2
11x/12 = 87.12
x = 8712/100 × 12/11
x = 95.04 m^2
Thus the actual steel used was 95.04 m^2 .
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