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Book I   Proposition 35
(The triangle EAB will be equal to the triangle FDC)

    Let DGE be subtracted from each;
therefore
    the trapezium ABGD which remains is equal to the trapezium EGCF which remains. [C.N.3]

    Let the triangle GBC be added to each;
therefore
    the whole parallelogram ABCD
is equal to
    the whole parallelogram EBCF. [C.N.2]
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