A right triangle is any triangle with an angle of 90 degrees.
In the example above, you see that angle C has a measure of 90 degrees, so it is a right triangle. The sides of a right triangle have two names. The hypotenuse is the side opposite the angle measuring 90 degrees, or in this picture, c. The legs are the other two sides.
All or almost all Trigonometric identities are based on right triangles.
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