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Question

(i) An ice-cream cone (ii) a cricket ball (iii) a glass tumbler (iv) a brick

Which of the above are polyhedrons?


A

i, ii, iii

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B

iii, iv

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C

i, ii

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D

iv

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Solution

The correct option is D

iv


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 a curved surface. 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. All the faces of a cuboid are joined by edges. So it is a polyhedron.


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