a right triangle has one right angle
A triangle with a right angle is a right triangle.
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A triangle with 1 right angle is a right angle 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.
A right triangle is a triangle in which one angle is a right angle (that is, a 90-degree angle). The relation between the sides and angles of a right triangle is the basis for trigonometry.
A triangle with one angle measuring 90˚ is a right triangleIt's a right triangle because the 90˚ angle is a right angle
A 90o angle is also called a Right Angle, so a triangle that has one 90o angle is a Right angle triangle.