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The ratio of the lateral surface area to the total surface area of a cylinder with height h and radius r is
Lateral surface area of a cylinder = 2πrh
Total surface area of the cylinder = 2πr(r + h)
The ratio of the curved surface area of a hemisphere to its total surface area is
Curved surface area of a hemisphere = 2πr2
Total surface area of the hemisphere = 3πr2
Ratio of the curved surface area of a hemisphere to its total surface area is 2:3.
Which of the following is correct?
Polyhedrons are 3-dimensional solids whose faces are polygons joint at their edges. Polyhedrons are regular and irregular and do not have curved surfaces.
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