The inner and outer radii of the hollow cylinder are 15cm and 20cm respectively. The cylinder is melted and recast into a solid cylinder of the same length. Find the radius of the base of new cylinder.
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Outer radius of old cylinder (R) = 20cm
Inner radius of old cylinder (r) = 15cm
radius of new cylinder(r) = ?
curved surface area of old cylinder = curved surface area of new cylinder
2pieh(R-r) = 2pierh
cut the 2pieh from both sides because these are same
(20-15) = r
5 = r
radius = 5cm
Inner radius of old cylinder (r) = 15cm
radius of new cylinder(r) = ?
curved surface area of old cylinder = curved surface area of new cylinder
2pieh(R-r) = 2pierh
cut the 2pieh from both sides because these are same
(20-15) = r
5 = r
radius = 5cm
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