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
• B. iii, iv, v
• C. i, ii
• D. iv, v

Answer 1

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.