This course represents a one-semester course in geometry, covering angles, circles, and triangles.

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Circles

by Sal Khan
This video is an introduction to finding the area and perimeter of rectangles and triangles.
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Special Triangles

by Sal Khan
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Inscribed Angles

by Sal Khan
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Khan Academy Geometry

by Sandy Gade
This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on proving theorems and results from basic postulates.
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