T H E E L E M E N T S |
Book I Proposition 23 | |
On the straight lines CD, CE respectively let the points D, E have been taken at random and let DE have been joined, Out of three straight lines which are equal to CD, CE, DE, let the triangle AFG have been constructed such that AF is equal to CD, AG is equal to CE, and further FG is equal to DE. [I.22] |
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