An isosceles right triangle is a type of triangle that has two sides of equal length and one right angle (90 degrees). The two equal sides are often referred to as the legs, while the third side, opposite the right angle, is called the hypotenuse. In an isosceles right triangle, the angles opposite the equal sides are each 45 degrees. These triangles are commonly found in various fields, including geometry and architecture. The properties of isosceles right triangles make them useful for calculating distances and angles, as well as for creating symmetrical designs.