The right triangle has one 90 degree angle and two acute (< 90 degree) angles.

There are two "special" right triangles, the

A right angle is an internal angle which is equal to 90°.

sum of the angles of a right triangle is always 180 degrees.

A right triangle may be scalene or isosceles.

Figure:Right Triangle |

__special right triangles__There are two "special" right triangles, the

**45º- 45º- 90º**triangle and the**30º- 60º- 90º**triangle. The "special" nature of these triangles is their ability to yield exact answers instead of decimal approximations when dealing with trigonometric functions.__Right Angle__A right angle is an internal angle which is equal to 90°.