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An isosceles triangle can never be a scalene triangle but it can take the shape of a right angle triangle
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.