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Question

# (i) An ice-cream cone (ii) a cricket ball (iii) a glass tumbler (iv) a brick (v) a star Which of the above are polyhedrons?

A

i, ii, iii

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B

iii, iv, v

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C

i, ii

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D

iv, v

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Solution

## The correct option is D iv, v A polyhedron is a three-dimensional shape having polygons as its faces usually joined by edges. An ice cream cone is in the shape of a cone. A cricket ball is in the shape of a sphere. A glass tumbler has the shape of a cylinder. Cone, sphere, cylinder have curved surface and therefore do not have edges. So they do not come under the category of polyhedrons. A brick has the shape of a cuboid. A cuboid has rectangular faces and no curved surface. A star also has no curved surface but it is not a solid it is a polygon. So, only brick is a polyhedron.

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