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Three Dimensions

Three Dimensions

A three dimensional shape has vertices, edges and planes. A vertex (the plural is vertices) is a point on the object, and a plane is a surface of the object. An edge is the intersection between two planes.

Parts of a three dimensional shape

Example 1

How many vertices does a cuboid have?

A vertex is a corner on a three dimensional object. Altogether, a cuboid will have 8 such points.

Answer: 8

Example 2

How many planes does a cuboid have?

A die is a cuboid; and has 6 sides.

Answer: 6