Question

what is the volume of constructing wall of a well 35m deep having outer and inner diameters 25m and 24 m respectively?

Answer 1

volume of the wall for building around the well...is like finding the volume or thickness of the hollow cylinder..
so the formula is....
π(R^2- r^2) × h..
so by substituting.. you will get
22/7 × (13.5^2 -12^2) × 35
... now,
22/7 × 37.75 × 35..
therefore the answer is...
vol of the wall is = 4152.5 metre cube
...
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