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( Right angle)
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. A right angle may be expressed in different units In mathematics, right angle can be an additional unit of angle[2]. 1r=90°=p/2 rad=100g
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