## Trig Functions & Geometry

The trig functions (sine, cosine and tangent) show up everywhere that we use
**vectors**:
**2D motion**,
**projectile motion**,
**forces**,
**torque**,
**momentum**
and more.

In this lesson we'll review some things we need to know about **trigonometry**, **right triangles**, **trig functions**, the **Pythagorean Theorem** and a few other things.

Since vectors show up everywhere in this course, using the right triangle trig functions is something you definitely need to be familiar with.

Also, is your calculator giving you a weird answer when using the trig functions? Check whether it's set to **degrees** (deg) or **radians** (rad).
In this lesson we'll answer the question, "what even is a radian?"

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###### Trigonometry

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###### Right triangle trig relationships

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###### Inverse trig relationships

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###### Radians

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###### Summary

The trig functions (sine, cosine and tangent) show up everywhere that we use
**vectors**:
**2D motion**,
**projectile motion**,
**forces**,
**torque**,
**momentum**
and more.

In this lesson we'll review some things we need to know about **trigonometry**, **right triangles**, **trig functions**, the **Pythagorean Theorem** and a few other things.

Since vectors show up everywhere in this course, using the right triangle trig functions is something you definitely need to be familiar with.

Also, is your calculator giving you a weird answer when using the trig functions? Check whether it's set to **degrees** (deg) or **radians** (rad).
In this lesson we'll answer the question, "what even is a radian?"

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