Parallel

ClueRightWrongClamUngraded
(2/-1) The 36 degree, 30 minute parallel marked the boundary between free territory and slave territory under this 1820 compromise.9852
(4/-2) In the Olympics, they are 2 m high, 3.5 m long and 42 to 52 cm apart.9843
(6/-3) "Heart of Glass" is a single from this band's Parallel Lines.80025
(8/-4) Playfair's axiom is equivalent to this Elements author's fifth postulate on parallel lines.72330
(10/-5) 22 pairs of Greeks and Romans were compared in this classical author's Parallel Lives.49650

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