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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
r:h
h:r
h:(r+h)
(r-h):r
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
2:3
1:3
3:4
None of these
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 do not have curved surfaces.
Two types of polyhedrons are regular and irregular polyhedrons.
Polyhedrons are 3-dimensional solids whose faces are polygons joint at their edges.
All of these
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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