|Book VI Proposition 20|
I say that
they are also in the same ratio as the wholes,
in such manner that the triangles are proportional, and ABE, EBC, ECD are antecedents, while FGL, LGH, LHK are their consequents,
the polygon ABCDE has to the polygon EFGKL a ratio duplicate of that which the corresponding side has to the corresponding side,
AB to FG.
let AC, FH be joined.
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