Let the radius and height of the old cylinder be 'r' units and 'h' units, respectively Volume of the old cylinder = π X r2 X h = πr2h cubic units Radius of the new cylinder = r X 2 = '2r' units Height of the new cylinder = h X 0.5 = '0.5h' units So, volume of the new cylinder = π X (2r)2 X 0.5h = 2πr2h cubic units So, required ratio = πr2h:2πr2h = 1:2
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