If it has one 90 degree angle then it is a right triangle.
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A triangle with 1 right angle is a right angle triangle.
Any triangle with a 90 degree angle is called a right triangle.
It will have an L shape flipped around at the corner. or you can use a protractor or type in google images 'right angle triangle' they will have an L shape at the corner of the right angled triangle.
a right triangle has one right angleA triangle with a right angle is a right triangle.
A right triangle and an isosceles triangle have the fact that they are both triangles in common. A right triangle can also be an isosceles triangle.