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Book I
Proposition 35
For, since
ABCD
is a parallelogram,
AD
is equal to
BC
.
For the same reason (
EBCF
is a parallelogram) also
EF
is equal to
BC
,
so that
AD
is also equal to
EF
; [
C.N.1
]
and
DE
is common
;
therefore
the whole
AE
is equal to the whole
DF
. [
C.N.2
]
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