Non-Euclidean geometry; a critical and historical study of its development (1912)
Bonola, Roberto, 1874-1911, Carslaw, H. S. (Horatio Scott), 1870-1954 · LaSalle, Ill. : Open Court Publishing Co. · leaf 187
ince the angle between those two chordsis zero. Since there are two chords through any point within acircle which join this point to the ends of any given chord,the fundamental proposition of hyperbolic geometry will beverified for the system {S). § 89. We proceed to find for the system {S)…
Geometry, Non-Euclidean
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