Definition:Euclid's Definitions - Book I/12 - Acute Angle
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Definition
In the words of Euclid:
- An acute angle is an angle less than a right angle.
(The Elements: Book $\text{I}$: Definition $12$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Definitions