T H E E L E M E N T S |
Book VI Proposition 31 | |
For the same reason also as BC is to CD, so is the figure on BC to that on CA; so that in addition as BC is to BD, DC, so is the figure on BC to the similar and similarly described figures on BA, AC. But BC is equal to BD, DC; therefore the figure on BC is also equal to the similar and similarly described bigures on BA, AC. |
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