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(18) Two distinct lines in the Riemannian plane that are perpendicular to the same line: (a)...

(18) Two distinct lines in the Riemannian plane that are perpendicular to the same line:

(a) are necessarily parallel. (b) necessarily intersect. (c) may either intersect or be parallel. (d) do not exist--you can't have two lines perpendicular to the same line in Riemannian geometry. (e) do not form 90°-degree angles with the giv8line

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