# Sin Cos Tan - Basic Trigonometry - Working unknown angles | Summary and Q&A

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May 29, 2013
by
tecmath
Sin Cos Tan - Basic Trigonometry - Working unknown angles

## TL;DR

This video provides a basic introduction to working with unknown angles in trigonometry, including labeling sides, using trigonometric functions, and solving for unknown angles.

## Questions & Answers

### Q: What are the basic steps for solving trigonometric questions involving unknown angles?

The basic steps are to label the sides of the triangle, determine the relevant trigonometric function (such as sine, cosine, or tangent), substitute in the given values, and solve for the unknown angle using the inverse of the trigonometric function.

### Q: How are the sides of a right angle triangle labeled in trigonometry?

In trigonometry, the longest side of a right angle triangle is called the hypotenuse. The side opposite the angle we are trying to find or given is called the opposite, and the side adjacent to the angle is called the adjacent.

### Q: What are some common trigonometric functions used in trigonometry?

The three main trigonometric functions used in trigonometry are sine (sin), cosine (cos), and tangent (tan). Sine is equal to opposite over hypotenuse, cosine is equal to adjacent over hypotenuse, and tangent is equal to opposite over adjacent.

### Q: How can the inverse function of a trigonometric function be used to solve for unknown angles?

The inverse function of a trigonometric function, denoted as "-1" or sometimes as "inverse", can be used to find the angle that corresponds to a specific ratio of sides. By applying the inverse function to the ratio, we can solve for the unknown angle.

## Summary & Key Takeaways

• This video is the third in a series on trigonometry, focusing on working with unknown angles in right angle triangles.

• It explains the process of labeling sides in a triangle and using trigonometric functions such as sine, cosine, and tangent.

• The video includes step-by-step examples of solving for unknown angles using trigonometry.

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