1.

When ‘h’ coins each of 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»

Thickness  = 1 unit

radius = r unit

Number or coins = h

When we stacked coins on upon the other, we get the object cylinder.

Height of formed cylinder = thickness of 1 coin x Number of coins

= 1 x h = h unit

Radius of formed cylinder = r unit

∴ C.S.A. of formed cylinder = 2πrh unit2



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