definition of right angle triangle
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A triangle in which one angle is measure 90° is called a right-angled triangle.
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A right triangle is a triangle in which one angle is a right angle (that is, a 90-degree angle). The side opposite the right angle is called the hypotenuse (side c in the figure). One angle is always 90° or right angle. The side opposite angle of 90° is the hypotenuse. The hypotenuse is always the longest side. The sum of the other two interior angles is equal to 90°.
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