T H E E L E M E N T S |
Book VI Proposition 13 | |
Since the angle ADC is an angle in a semicircle, it is right. [III.31] And, since, in the right-angled triangle ADC, DB has been drawn from the right angle perpendicular to the base, therefore DB is a mean proportional between the segments of the base, AB, BC. [VI.8, Por.] |
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