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AB = BC = AC

4. A right triangle is a triangle in which one of the angles is a right angle (90 degrees).

The longest side    of  a   right   triangle,   which   is  always  opposite    the 90-degree   angle,  is  called  the

hypotenuse.

AC  is  the hypotenuse.

Some    right   triangles   are also    isosceles.  The angles  in  an  isosceles   right   triangle    always  measure

45°,    45°,    and 90°.