Study Right Triangle in Geometry with concepts, different types of right triangles , Pythagorean triplets, and understand more about the right triangle with solved examples and practice questions. 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-angle triangle is a triangle in which the measure of one angle in a triangle is 90 degrees. The relation between the sides and angle of a right angle triangle is the basis of trigonometry. 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.