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There is a very detailed explanation of it here:

The Wikipedia Quote:

"In geometry and trigonometry, a right angle is an angle of 90 degrees, corresponding to a quarter turn (that is, a quarter of a full circle). It can be defined as the angle such that twice that angle amounts to a half turn, or 180°.[1]

Lines that are at a right angle to each other are perpendicular, an important geometrical property. The presence of a right angle in a triangle is the defining factor for right triangles."

Includes CC-BY-SA content from Wikipedia's Right_angle article (authors)

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