|Book I Proposition 36|
let BE, CH be joined.
BC is equal to FG (hypothesis) while EH is equal to FG,
BC is also equal to EH. [C.N.1]
But they are also parallel. And EB, HC join them;
but straight lines joining equal and parallel straight lines (at the extremities which are) in the same directions (respectively) are equal and parallel. [I.33]
EBCH is a parallelogram. [I.34]
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