Q.

Which amongst the following is not a polyhedron?



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a

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b

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c

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d

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answer is C.

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Detailed Solution

Given four solids and we need to find the solid which is not a poplyhedron.
We know that,
Polyhedron is a solid with flat faces and in the given option only the cone does not have one flat surface.
That means the cone is not a polyhedron.
Hence, option (3) is correct.
 
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