The 90 degree angle in a right angle triangle is opposite its hypotenuse.
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A triangle with 1 right angle is a right angle triangle.
a right triangle has one right angleA triangle with a right angle is a right triangle.
A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.
If one angle is a right angle, it is a right triangle. If one angle is an obtuse angle, it is an obtuse triangle. If there are no right nor obtuse angle then it is an acute triangle.
By using trigonometry that is applicable to a right angle triangle.