T
H
E
E
L
E
M
E
N
T
S
Book VI
Proposition 1
For
let
BD
be produced in both directions to the points
H
,
L
and
let
BG
,
GH
be made equal to the base
BC
and
any number of straight lines
DK
,
KL
equal to the base
CD
;
let
AG
,
AH
,
AK
,
AL
be joined
.
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