Right triangle
Triangle containing a 90-degree angle
Right triangle
A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1⁄4 turn or 90 degrees). The side opposite to the right angle is called the hypotenuse (side c {\displaystyle c} in the figure). The sides adjacent to the right angle are called legs (or catheti, singular: cathetus). Side a {\displaystyle a} may be identified as the side adjacent to angle B {\displaystyle B} and opposite (or opposed to) angle A , {\displaystyle A,} while side b {\displaystyle b} is the side adjacent to angle A {\displaystyle A} and opposite angle B . {\displaystyle B.} Every...
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