T H E E L E M E N T S |
Book I Proposition 36 | |
For let BE, CH be joined. Then, since 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] Therefore EBCH is a parallelogram. [I.34] |
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