Proposition VI.21 — Figures which are similar to the same rectilineal figure are…

Proof

Equiangularity transfers transitively, and the side ratios compose transitively by V.11.

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Depends on (2)

V.11Proposition V.11Ratios which are the same with the same ratio are also the same with one another.
VI.4Proposition VI.4In equiangular triangles the sides about the equal angles are proportional, and those are corresponding sides which…

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