When 'h' coins each of the radius 'r' units and thickness 1 unitbisvstacked one upon the other, what would be the solid object you get? Also find its C.S.A.
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the solid will be a cypinder
it's C.S.A is 2πrh.
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No. of coins = h
Radius of a coin = r units
Thickness of a coin = 1 unit
If h coins is stacked one upon other, the resulting solid is Solid right circular Cylinder.
Height of the cylinder = h(no. of coins) × 1 >>> h units.
Radius of the cylinder = r units.
CSA of the cylinder = 2πrh sq.units.
If we substitute the value, we would get the same formula as bolded above
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