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Topic: Exterior Angle without parallels?
Replies: 1   Last Post: Dec 21, 2007 2:18 PM

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Alexander Bogomolny

Posts: 406
Registered: 12/4/04
Re: Exterior Angle without parallels?
Posted: Dec 21, 2007 2:18 PM
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Jacobs proceeds in the footsteps of Euclid who proved the Exterior Angle Theorem as I.16 but used the Parallel Postulate in I.29 for the first time.

See a discussion at

http://www.cut-the-knot.org/fta/Eat/EAT.shtml

A. Bogomolny



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