T
H
E

E
L
E
M
E
N
T
S
Book I   Proposition 45
    Let DB be joined,
and
    let the parallelogram FH be constructed equal to the triangle ABD, in the angle FKH which it equal to E; [I.42]

    let the parallelogram GM equal to the triangle DBC be applied to the straight line GH, in the angle GHM which is equal to E. [I.44]
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