T H E E L E M E N T S |
Book I Proposition 42 | |
Let BC be bisected at E and let AE be joined; on the straight line EC, and at the point E on it, let the angle CEF be constructed equal to the angle D; [I.23] through A let AG be drawn parallel to EC, [I.31] and through C let CG be drawn parallel to EF. |
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