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Definition of a right triangle with introduction and know its sides and angles , study the properties of right angled triangle in geometric mathematics. A right - angled triangle has one angle at 90 degrees. The side opposite the right angle is called the hypotenuse. Learn more about the right angle and Pythagoras theorem here. Learn what a right triangle is, how to identify its sides and angles, and how to calculate its area and perimeter. Explore the properties, shape, and Pythagoras theorem of right triangles with examples and videos. In this article, we will learn about the right-angle triangle, its definition, perimeter, area, right-angled triangle formula, and its properties in detail. What is a Right Angled Triangle? A right-angled triangle is a type of triangle that has one of its angles measuring exactly 90 degrees .