right triangle | Right Angle | Special right triangles

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

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