Euclid S Elements Book 1 Prop 4

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If a triangle has two sides equal to two sides in another triangle, and the angle between them is also equal, then the two triangles ...

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Given a triangle, construct a circle inside the triangle such that the circle touches all three sides of the triangle.

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If two triangles have two sides equal to two sides, respectively, and have the angle enclosed by the equal straight-lines equal, ...

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Euclid's Elements

Side Angle Side theorem from the

Euclid’s Elements Book 4 Proposition 4

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Euclid's Elements Book 1