Which figure is not completely constructed from polygons?
A. tetrahedron
B. pyramid
C. cylinder
D. cube
11 Answers
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cylinder
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Cylinder.
Polygons are basically two dimensional objects made up of straight lines.
Although a circle is also a two dimensional object, it is made up of a “curved” line as opposed to a straight one.
Hence, since the cylinder has two circles it is the only one not completely made up of polygons.
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Polygons are composed of a finite sequence of straight line segments.
The cylinder does not, it has two circles (not polygons). You may say that could unwrap the lateral side into a rectangle.
The others have triangles, and/or squares, which are polygons.
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C. Cylinder—>not formed from polygons
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A cylinder. The faces are circles which are not polygons.
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Cylinder is not a polygon because it has no straight sides
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C. Cylinder, because its curved face is not a polygon. Note that the curved face can be unfolded into a rectangle, but it requires that you artificially introduce an edge that is not present in the solid figure.
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A cylinder because it has no sides.
Source(s): Engineering graduate -
cylinder
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cylinder
