T H E E L E M E N T S |
Book VI Proposition 4 | |
Now, since the angle DCE is equal to the angle ABC BF is parallel to CD. [I.28] Again, since the angle ACB is equal to the angle DEC AC is parallel to FE. [I.28] Therefore FACD is a parallelogram; therefore FA is equal to DC, and AC to FD. [I.34] |
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