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### Course: Algebra (all content) > Unit 20

Lesson 9: Matrices as transformations- Transforming vectors using matrices
- Use matrices to transform 3D and 4D vectors
- Transforming polygons using matrices
- Transform polygons using matrices
- Matrices as transformations
- Matrix from visual representation of transformation
- Visual representation of transformation from matrix
- Understand matrices as transformations of the plane

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# Transforming polygons using matrices

Sal transforms a triangle using a 2x2 matrix. Created by Sal Khan.

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