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Book I
Proposition 2
For
let the line
AB
have joined the point
A
to the point
B
, [
Post.1
]
let the equilateral triangle
DAB
have been constructed on that line itself
, [
I.1
]
and
let the straight lines
AE
,
BF
have continuously extended the straight lines
DA
and
DB
.
[
Post.2
]
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