Why 90° is also called right angle?
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In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.
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The term right in right angle comes from the meaning of right as proper, or in accordance to justice or equality. It comes from the way a right angle was originally defined. When two straight lines intersect they form two angles. When these angles are equal then this is a fair or just situation and the angles are "right"
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