What is Right triangle?
[[Image:Triangle.Right.svg|right|Right triangle]] A '''right triangle''', (also called a [[right angle|right-angled]] [[triangle]]), has [[one]] [[angle]] that is 90 [[degree (geometry)|degrees]]. The other two angles always [[add]] up to 90 degrees but can be different sizes. The [[side]] opposite to the right angle is the [[hypotenuse]]; it is the longest side in the right triangle. The other two sides are the legs or catheti (singular: cathetus) of the triangle. Missing sides or angles of a right triangle can be found using [[trigonometry]], the [[Pythagorean theorem]], and many other ways. In any triangle all the angles add up to 180 degrees. {{Polygons}} {{math-stub}} [[Category:Polygons]] [[Category:Trigonometry]]