T H E E L E M E N T S |
Book III Proposition 30 | |
But equal straight lines cut off equal circumferences, the greater equal to the greater, and the less to the less; [III.28] and each of the circumferences AD, DB is less than a semicircle; therefore the circumference AD is equal to the ciecumference DB. Therefore The given circumference has been bisected at the point D. Being what it was required to do. |
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