May 12, 2013 · Learn about the special relationship between the sides and angles of a right triangle, and how to calculate the angles of a right triangle.

One type of triangle is a right triangle; that is, a triangle with one right (90 degree) angle. The right angle is usually marked with a small square in that corner, as shown in the image.

The definition of a right triangle is a triangle in which one of the interior angles measures 90 degrees. This 90-degree interior angle is also referred to as a right angle.

A right triangle must have three sides and must be a closed shape. One of the angles must be a 90-degree angle which is where the triangle gets its name since a 90-degree angle is a right angle.

Learn how to use trigonometric ratios to solve for an angle of a right triangle, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to use right triangles to find the slope of line, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

A 45-45-90 triangle is named for the degrees of the three inner angles of the triangle. Since two of the angles are smaller than the third, the 45-45-90 triangle is considered an isosceles triangle.

Learn how to solve a right triangle, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Right Triangles and Opposite, Adjacent and Hypotenuse A right triangle is a triangle where one of the angles is equal to 90 degrees.

Learn how to identify right triangles from coordinates, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.