Why do we study trigonometry?

Trigonometry is used everywhere where angles and/or curves are involved. The simplest use of trig is to find missing parts of a right triangle. In this way it is used by engineers, astronomers, surveyors, and others. Trig helps to indirectly measure distances and heights. For example, a surveyor can measure width of a river or any other distance on a plane:

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In the similar manner basic trigonometry can be used to measure heights of objects above the ground (buildings, planes, mountains, etc.)

Astronomers use trig to calculate distances to objects in space:

Trig is also the basis for calculus, so those who are planning to study calculus in college have to know it.

There exist many other much more complex applications of trigonometry in real life. If you are interested in learning more about trigonometry and its uses check the Useful Links section of this web site.