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What does multiplication do geometrically?

What does multiplication do geometrically?

Author: Danny Whittaker
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Tutorial

Multiplication by complex numbers geometrically

Here are 3 videos describing the geometric interpretation of multiplication by complex numbers.  Followed by a thinking question, enjoy!

What does multiplication by a pure number mean?

Describes what happens when you multiply a number by a purely real number or a purely imaginary number.

What does multiplication by a complex number mean?

Describes the geometric interpretation of multiplying by a complex number.

An application in Tetris

Does Tetris use multiplication by complex numbers?

Quiz

Respond to my question in the Q & A section below.