right-angle triangle has at least one right angle .
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No, if a Triangle has a right angle it is automatically called a right triangle.
A right triangle has one right angle and two acute angles. Right triangles have a hypotenuse and also two legs. You can use the Pythagorean Theorem to find the hypotenuse, or the two legs of the right triangle, as long as you have the side lengths of the other two sides on the right triangle.
Yes if it's a right angle triangle
That would be a right triangle. Any triangle that has a right angle in it is a right triangle.
If a triangle has a right angle, it is a right triangle.