Proof: By Euclid
(related to Corollary: Angles and Sides in a Triangle V)
This corollary follows immediately from the proposition 1.24 and its conversion, the proposition 1.25.
∎
Thank you to the contributors under CC BY-SA 4.0! 
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References
Adapted from CC BY-SA 3.0 Sources:
- Callahan, Daniel: "Euclid’s 'Elements' Redux" 2014
Adapted from (Public Domain)
- Casey, John: "The First Six Books of the Elements of Euclid"
