A right triangle consists of one angle of 90^{o}and two acute angles.
Each acute angle of a right triangle has the properties of sine, cosine and tangent.
The sine, cosine and tangent of an acute angle of a right triangle are ratios of two
of the three sides of the right triangle.

The *sine*** of the angle is the ratio of the length of the side opposite the angle divided
by the length of the hypotenuse.
**

**The ***cosine*** of the angle is the ratio of the length of the side adjacent to the angle
divided by the length of the hypotenuse.
**

**The ***tangent*** of the angle is the ratio of the length of the side opposite the angle
divided by the length of side adjacent to the angle.
**