# Area of Circle/Proof 3/Historical Note

< Area of Circle | Proof 3

## Historical Note on Archimedes's Proof of Area of Circle

The area $A$ of a circle is given by:

- $A = \pi r^2$

where $r$ is the radius of the circle.

The area of a circle was determined by Archimedes in his *Measurement of a Circle*.

## Sources

- 1937: Eric Temple Bell:
*Men of Mathematics*... (previous) ... (next): Chapter $\text{II}$: Modern Minds in Ancient Bodies - 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {A}.5$: Archimedes (ca. $287$ – $212$ B.C.)