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### Course: Pixar in a Box>Unit 14

Lesson 2: Mathematics of rotation

# 2. Geometry of rotation

We start with a point, let's call it P, and we want to find out where it goes when we spin it around. Lets build a diagram that break rotation into smaller parts. The next exercise will give us a chance to build our understanding of this diagram. Click here to learn about rotation using linear transformations.

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## Want to join the conversation?

• how do i use these videos in making my own movie
• so that you can understand when coding, what are the basic things you want to do
(1 vote)
• y is there so much math - -
-
• Whats sin and theto (or whatever) and cos
• Sin (Sine) and cos (cosine) are trigonometric functions. If you are unfamiliar with these, you might want to check out the trigonometry section on Khan Academy. Theta is just the name given to a variable angle, in the same way that x and y are the names given to variable numbers.

Trigonometry stuff:
You might want to double check that in video 2 you might get the sign incorrect for the expression of y'.
• At , the formula for y prime has a "+" sign between the 2 terms, but at it has a "-" sign between the 2 terms. Per the proof in video 3, it should be a "+" sign, right?
(1 vote)
• which classes exactly come under high school level
(1 vote)