## Geometry and Trigonometry## Trigonometry |

## How are trigonometric functions used to describe a right triangle? |

The trigonometric functions can be interpreted using the following illustration of a right triangle. If θ is the angle (see illustration), *a* is one leg (called the *adjacent* because it is adjacent to the angle), *b* is another leg (called the *opposite,* because it is opposite the angle), and *c* is the hypotenuse: