H
E
E
L
E
M
E
N
T
S
since CD is parallel to BF,
therefore,
as BC is to CE,
so is FD to DE. [VI.2]
But
FD is equal to AC;
therefore,
as BC is to CE,
so is AC to DE,
and alternately,
as BC is to CA,
so is CE to ED. [V.16]
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T H E E L E M E N T S |
Book VI Proposition 4 | |
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Again, since CD is parallel to BF, therefore, as BC is to CE, so is FD to DE. [VI.2] But FD is equal to AC; therefore, as BC is to CE, so is AC to DE, and alternately, as BC is to CA, so is CE to ED. [V.16] |
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