Introduction to transformations | Transformations | Geometry | Khan Academy
A more formal understanding of functions | Matrix transformations | Linear Algebra | Khan Academy
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Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
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Inradius, perimeter, and area | Special properties and parts of triangles | Geometry | Khan Academy
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Angle bisector theorem proof | Special properties and parts of triangles | Geometry | Khan Academy
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