Line perpendicular to a plane

The telephone pole is perpendicular to a plane, which in this case is the ground. In order to have a line that is perpendicular to a plane you need a line to intersect a plane at 90 degrees. The definition of perpendicular is the measure of 90 degrees when two objects intersect. In this case the telephone pole intersects the ground at 90 degrees, so it is a line perpendicular to a plane. Telephone poles are used to connect people using phones to communicate with one another and for transporting electricity. Telephone repairmen, communication engineers, and electrical workers work with telephone poles.

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