Tathagata – Resources – GeoGebra

Centroid
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Circumcenter
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Orthocenter
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Euler Line
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Euler Line and the 4th Center of the Triangle
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Incenter
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Centers of Triangles, and Symmetry
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Ptolemy's Theorem
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Reflection over a Circle
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Problem 1 : Can you guess the sum of the angles?
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Proof of Ptolemy's Theorem
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Ptolemy Application 1
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Ptolemy Application 2 - Golden Ratio
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Tathagata