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exploring
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Elements Book I Postulates

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Postulate I.4

Right Angles are Equal

That all right angles are equal to one another.

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angles

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Proposition 13.6
Proposition 13.4
Proposition 6.30
Proposition 2.11
Definition 6.3

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Proposition 9.27
Proposition 9.28
Proposition 9.29
Proposition 9.30

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[507]
extreme and mean [15]
lines [12]
angles [7]
theorem [6]
figures [5]
circles [5]
planes [4]
triangles [4]
people [3]
points [2]
organization [1]
boundaries [1]
squares [1]
rhombuses [1]
segments [1]

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proposition [1]
construction [1]

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