Any that do not have one angle that is exactly 90 degrees
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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.
An isosceles triangle has two equal sides and two equal angles. A right triangle is any triangle with one angle that is a right angle. A right triangle could also be an isosceles triangle, but an isosceles triangle will not always have a right angle.