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December 4th, 2016, 02:28 PM  #1 
Newbie Joined: Dec 2016 From: United States Posts: 3 Thanks: 0  Proving perpendicular lines in hyperbolic geometry
Hi everyone, This is actually a college level geometry question, I just wasn't sure where to post it. This question pertains to the hyperbolic plane. Suppose ABO is an asymptotic triangle and <A = <B. If M is the midpoint of the finite side AB, prove that the line MO is perpendicular to AB. Proof: Since O is an ideal point (on fundamental circle), we know that AO and BO are parallel lines such that they do not intersect. We also know that the degree of O is zero. Construct M on AB. Then, MO is also parallel to AO and BO. Also, <OAM and <OBM are supplementary lines forming 180 degrees. I'm stuck up to this point. I'm not sure how to prove that the angle formed at M is 90 and is perpendicular to AB. Could I go about this by saying that since AO and BO are parallel, then AB acts as a transversal? Then <A + <B = 180 since they are supplementary. Then, <A=<M since they are corresponding angles. and <M=<B since <A=<B. Thanks for any help! 

Tags 
geometry, hyperbolic, lines, perpendicular, proving 
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