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They are the triangles that contain a 90 degree angle and two acute angles
There are three types of triangles. Equilateral triangles have three congruent sides and three sixty-degree angles. Isosceles triangles have two congruent sides and the angles opposite those two sides are also congruent. Scalene triangles have no congruent sides or angles.
All right angle triangles have a 90 degree angle and two acute angles that add up to 90 degrees
There are three basic types of triangles. Equilateral triangles have three congruent (equal) sides and three sixty-degree angles. Isosceles triangles have two congruent sides and the two angles opposite those sides are also congruent. Scalene triangles have no congruent sides or angles. Right triangles are another type of triangle and they have one ninety-degree angle. Right triangles can either be scalene or isosceles.
All right angle triangles have a 90 degree angle and two acute angles which all together the 3 angles add up to 180 degrees.