# Trigonometry with Right Triangles

## Convert Angles between Degrees and Radians

Another way to represent an angle is by using radians. Without getting too technical, a radian is defined as the angle between 2 radii (plural for radius) of a circle where the arc between them has length of one radius. While it’s not stated in the animation, the arc length equals…

## Problem Solving with Trigonometric Functions

Many application problems involving right triangles use words like angle of depression and angle of elevation. The angle of depression is angle measured below the horizontal, and may also be called the angle of declination. The angle of elevation is the angle measured above the horizontal (see figure below), and may also be called the angle of inclination.…

## Reciprocal Trigonometric Functions

Taking the reciprocal of any value – whether it’s a number, letter, or fraction – means you flip the value over 1. Take for example the number 5. If we flip 5, it becomes a fraction 1/5. 1/5 is the “reciprocal” of 5. How about the fraction 7/8. If we flip…

## Trigonometric Functions

The only prerequisite to learning trigonometry is knowing the Pythagorean theorem. If you’d like to touch up on the Pythagorean theorem, review this video link for clarification. Feel free to skip it if you’re comfortable with the concept. The reason it’s important is because the theorem introduces you to two key terms:…

## Convert between Degrees, Minutes, and Seconds and Decimal Degrees

Now that you’ve become an expert at converting units and rates, we can now extend our understanding of this concept to convert units used to measure angles in trigonometry, namely degrees and radians. An angle is a geometric figure consisting of two rays with a common endpoint. The angle below is…