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Playlist of Euclid's Elements in link below:
• Euclid's Elements Book 1
In proposition 5, we prove that with any isosceles triangle, the base angles are always congruent.
Watch video (I.5) Base Angles of an Isosceles Triangle are Congruent, Proof online without registration, duration hours minute second in high quality. This video was added by user mathematicsonline 18 August 2012, don't forget to share it with your friends and acquaintances, it has been viewed on our site 27,108 once and liked it 178 people.