Consider a hyperbolic triangle ABC with angle measures (A) = , (B ) = and
(C ) = . The purpose of this note is to develop formulae that allow for a computation of
the hyperbolic lengths a = d(AB ), b = d(AC ) and c
Graded home work no. 3
[Due on November 5-th]
Instructions: Those enrolled in the course as MATH-475 only need to complete
problems 13, everybody else should turn in all problems.
1. Recall that a quadrilateral ABCD is called a Saccheri quadrilateral if A
Euclidean and non-Euclidean geometry
November 12, 2008
Midterm exam 2
[Due on November 19]
1. Recall that in the Beltrami-Klein model, lines are open chords of a circle .
Recall also that a line in this model is perpendicular to a line m if m