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Book VI
Proposition 4
Let
ABC
,
DCE
be equiangular triangles having the angle
ABC
equal to the angle
DCE
, the angle
BAC
to the angle
CDE
, and further the angle
ACE
to the angle
CED
;
I say that
in the triangles
ACE
,
DCE
the sides about the equal angles are proportional, and those are corresponding sides which subtend the equal angles
.
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