That's simply called a right triangle.
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A right-angle triangle.
A right triangle is a triangle that contains a 90 degree angle, an obtuse triangle contains an angle that is from 91 degrees to 179 degrees.
right angle
A right angle triangle
right triangle. pretty easy! lol. if it makes a right angle it should be a right triangle. if it is acute. it is an acute triangle, and the same with obtuse. its all simple to remember