Finding Center of Circle/Proof 2/Historical Note

Historical Note on Proof $2$ of Finding Center of Circle

This proof was formulated by Augustus De Morgan who preferred to prove the more fundamental result first, wording it as:

The line which bisects a chord perpendicularly must contain the center

and then use that to prove this.

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 2 (2nd ed.) ... (previous) ... (next): Book $\text{III}$. Propositions