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## Pixar in a Box

### Unit 14: Lesson 2

Mathematics of rotation

# Start here!

Overview of this lesson

## Ready to dive into some more math?

In this lesson we are going to derive a powerful formula which will calculate where any point left parenthesis, x, comma, y, right parenthesis goes afterrotation by an angle theta about the origin.
The formulas we'll end up with are:

# What do I need to know before starting?

To derive the rotation formulas we are going to use the basic trig ratios sine and cosine. If you don't remember these ratios you can click here to watch a video review.

## Want to join the conversation?

• im an 8th grade and this confuses mexD
• I looked at the pictures of the math formulas, and I'm totally feel like I've been overwhelmed. I've gotten this far and now I feel like I'm stuck at an IMPOSSIBLE roadblock. Help!
• Hello!
That's ok. Everyone gets stuck at one point in time. Perhaps you should learn Trigonometry, so then you can get a better understanding of things. Here's the link:

Hope this helps!
---Inspirable Learner
• isnt cosine and sine trigonomitry
• Why does this have to be required? I am not interested, but I have to. I mean,it's a learning experience on how to do all that stuff that Pixar does, but unless you're going to be a Pixar person, what do I need this skill for?
• i am in 10,00000000000 grade and i know every thing in this worlds and other worlds
(1 vote)
• Okay? What's General Relativity then?
(1 vote)
• i think its ok that i am a 5th grader but i still watch your videos and do your activities. its kind of fun andienjoy it.

Thank you so so much for creating this on Khan Academy.
plus i am 10 years old :)
(1 vote)