T H E E L E M E N T S |
Book VI Proposition 31 | |
And, since ABC is similar to ABD, therefore CB is to BA, so is AB to BD. [VI.Def.1] And, since three straight lines proportional, as the first is to the third, so is the figure on the first to the similar and similarly described figure on the second. [VI.19, Por.] Therefore, as CB is to BD, so is the figure on CB to the similar and similarly described figure on BA. |
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