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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? Explain.
[5 marks]
(i) An ice-cream cone (ii) a cricket ball (iii) a glass tumbler (iv) a brick.
Which of the above are polyhedrons? Explain.
[5 marks]
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Solution
A polyhedron is a three-dimensional shape having polygons as its faces are usually joined by edges.
[1 mark]
An ice cream cone is in the shape of a cone.
[1 mark]
A cricket ball is in the shape of a sphere.
[1 mark]
A glass tumbler has the shape of a cylinder.
[1 mark]
Cone, sphere, and cylinder have curved surfaces. So, they do not come under the category of polyhedrons.
Whereas, A brick has the shape of a cuboid. A cuboid has rectangular faces and no curved surface.
So, only "a brick" is a polyhedron.
[1 mark]
A polyhedron is a three-dimensional shape having polygons as its faces are usually joined by edges.
[1 mark]
An ice cream cone is in the shape of a cone.
[1 mark]
A cricket ball is in the shape of a sphere.
[1 mark]
A glass tumbler has the shape of a cylinder.
[1 mark]
Cone, sphere, and cylinder have curved surfaces. So, they do not come under the category of polyhedrons.
Whereas, A brick has the shape of a cuboid. A cuboid has rectangular faces and no curved surface.
So, only "a brick" is a polyhedron.
[1 mark]
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