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Book I   Proposition 36
And
    ABCD is equal to EBCH,
for
    they have the same base BC
and are in
    the same parallels BC, AH. [I.35]

For the same reason also
    EFGH is equal to EBCH.


Therefore,
    the parallelogram ABCD is equal to the parallelogram EFGH. [C.N.1]
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