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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