|Book VI Proposition 16|
as AB is to CD, so is E to F,
E is equal to CH, and F to AG,
as AB is to CD, so is CH to AG.
in the parallelograms BG, DH the sides about the equal angles are reciprocally proportional.
those equiangular parallelograms in which the sides about the equal angles are reciprocally proportional are equal; [VI.4]
the parallelogram BG is equal to the parallelogram DH.
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