Question

When 'h' coins each of the radius 'r' units and thickness 1 unit is stacked one upon the other, what would be the solid object you get? Also find its C.S.A.

Answer 1

Answer: the solid object so formed will be a cylinder..  The curved surface area of a cylinder is 2πrh.. So here h=1 and r is already given so the curved surface area would be 2πr..

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Step-by-step explanation:

Answer 2

Given: When 'h' coins each of the radius 'r' units and thickness 1 unit is stacked one upon the other

Explanation:

number of coins be h

radius = r

thickness = 1 unit

then

When 'h' coins each of the radius 'r' units and thickness 1 unit is stacked one upon the other, it will form a cylinder

here , height = 1 × h = h units

thus

CSA of the cylinder is $2\pi r h$

where r is the radius of the cylinder and h is the height of the cylinder

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