Yes. A right triangle is a triangle where one angle is a right angle. If two out of three angles are right angles, then it's an isosceles triangle. If all three angles are right angles, then it is an equilateral triangle.
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The right-angled triangle.
A right angle triangle
The longest side of a right-angled triangle is always opposite the right-angle and is called the hypotenuse.
First: there can only be one hypotenuse in a right angled triangle and it is always OPPOSITE the right angle, NEVER adjacent.
a right angled triangle is special because it is the only triangle that has a right angle with a dregree of 180.