How much iron sheet (in m2) will be needed to construct a rectangular tank measuring 10 m × 8 m × 6 m, if a circular opening of radius one metre is to be left at the top of the tank? (correct to one decimal place)
Show answer & explanation
Correct answer: C
Explanation
Correct Answer is option 3 i.e. 372.9
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Concept |
Understanding |
Application |
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Surface area of rectangular tank = 2(lb + bh + hl) |
The required area of iron sheets Radius of circular hole = 1 m |
The required area of iron sheets = 2(10 x 8 + 8 x 6 + 10 x 6) – πr2 = 2(80 + 48 + 60) – 3.14 × 1 = 2 x 188 – 3.14 |