That's called a "right triangle".
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A right triangle.
A right-angle triangle must have one corner of 90 degrees.
A right triangle because the 90 degree angle creates a corner.
A right triangle has one exterior angle that's 90 degrees. No other kind of triangle has. All three of the triangle's exterior angles always add up to 360 degrees.
Acute Triangle - All of the angles are under 90 degrees. Right Triangle - One angle is 90 degrees Obtuse Triangle - A triangle that has one angle greater than 90 degrees.