T H E E L E M E N T S |
Book VI Proposition 19 | |
Therefore, similar triangles are to one another in the duplicate ratio of the corresponding sides. Being what it was required to prove. Porism. From this it is manifest that, if three straight llines be proportional, then, as the first is to the third, so is the figure described on the first to that which is similar and similarly described on the second. |
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