Triangles
Early mathematicians found many surprising triangle facts, such as how the altitudes, medians, angle bisectors and perpendicular bisectors each meet at a single point. In geometric proofs, SSS and SAS are two of the most powerful tools in the toolbox.
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Euclid Book 1 Proposition 1
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Euclid Book 1 Proposition 4
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Euclid Book 1 Proposition 5
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Euclid Book 1 Proposition 6
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Euclid Book 1 Proposition 7
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Euclid Book 1 Proposition 8
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Euclid Book 1 Proposition 16
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Euclid Book 1 Proposition 17
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Euclid Book 1 Proposition 18
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Euclid Book 1 Proposition 19
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Euclid Book 1 Proposition 20
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Euclid Book 1 Proposition 21
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Euclid Book 1 Proposition 22
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Euclid Book 1 Proposition 24
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Euclid Book 1 Proposition 25
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Euclid Book 1 Proposition 26a
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Euclid Book 1 Proposition 26b
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Euclid Book 1 Proposition 32
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Euclid Book 1 Proposition 37
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Euclid Book 1 Proposition 38
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Euclid Book 1 Proposition 39
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Euclid Book 1 Proposition 40
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Euclid Book 1 Proposition 47
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Euclid Book 1 Proposition 48
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Euclid Book 6 Proposition 1a
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Euclid Book 6 Proposition 2a
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Euclid Book 6 Proposition 2b
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Euclid Book 6 Proposition 3a
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Euclid Book 6 Proposition 3b
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Euclid Book 6 Proposition 4
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Euclid Book 6 Proposition 5
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Euclid Book 6 Proposition 6
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Euclid Book 6 Proposition 7a
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Euclid Book 6 Proposition 7b
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Euclid Book 6 Proposition 8
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Euclid Book 6 Proposition 15a
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Euclid Book 6 Proposition 15b
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Euclid Book 6 Proposition 19
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Euclid Book 6 Proposition 32