A right-angled triangle is any triangle having one right angle. The side opposite the right angle is called the hypotenuse. A right-angled riangle may be isosceles or scalene.
Right-Angled Triangles
Right Angled Triangle (Definition, Properties, Formulas)
Right Angle - Definition, Properties, Shape, Examples
Right Angle Trigonometry Western Sydney University
File:Black right angled triangle 4.png - Wikipedia
Spr9.6.4 - Calculate the hypotenuse of a right-angled triangle on Vimeo
Given the triangle is right-angled, find the value of a. - Mathematics Stack Exchange
Right Angled Triangle (Definition, Properties, Formulas)
Area Of A Non-Right Angle Triangle