Page 127 - Fun with Mathematics 2

Cuboid

We see so many objects around us that have
a shape similar to that of a cuboid such as a Vertex

matchbox, wooden almirah, brick and book. Face

Properties of a cuboid: Edge
A cuboid has 6 plane surfaces, 8 vertices and 12 edges.
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Each face of a cuboid is rectangular in shape.
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The opposite faces of a cuboid are identical.
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Cube

Objects such as ice cubes, sugar cubes, dice and chalk
box resemble the shape of a cube. Vertex

Properties of a cube: Face

A cube has 6 faces, 8 vertices and 12 edges.
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Each face of a cube is square shaped. Edge
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All faces of a cube are identical to each other.
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Cylinder

Objects such as a gas cylinder, can of a soft drink, tin of Plane
talcum powder, measuring jar, drum, tubelight, water surface

storage tank, thread-reel and log of wood have the shape
of a cylinder. Curved
surface
Properties of a cylinder:

A cylinder has 2 plane surfaces and 1 curved surface. Base
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It has 2 edges in circular shape.
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It has no vertex.
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The base and the top of the cylinder are of the same shape and size.
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Sphere
Objects such as a woollen roll, football and globe have

the shape of a sphere.

Properties of a sphere: Curved
A sphere has only 1 curved face. surface
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It has no vertex and no edge.
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