A right triangle is a triangle in which one of the three angles measures 90°. In other words, it is a triangle with two sides that are perpendicular to each other.
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A triangle with a 90° angle is called a "right triangle."
A right angle triangle
right angle=90 degrees and a right triangle has one side of it that forms a 90 degree angle...as for the naming "right" don't know but it refers to 90 degree angle
Because the phrase 'right angle' indicates 90 degrees whereas there is no such angle as a 'left angle'
It is a right triangle or right-angled triangle. The right-angle is 90 degrees.