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a = b = 66∘ 31∘ a b c c = b = a = b 14∘ a 28∘ a = 54∘ a a = Vertically Opposite Straight Line Alternate Click the reason a 73∘ b = a = 23∘ a b a = a 12 a = a 99∘ 11∘ a = 29∘ 42∘ a b = a = 24∘ a b 33∘ a = 42∘ a b = a = a b 76∘ a = 17.5∘ a b = a = 163∘ a 83∘ b a = a Straight Line Alternate Vertically Opposite Click the reason 92∘ a = a 43∘ Corresponding Alternate Vertically Opposite Click the reason a = a 125∘ Vertically Opposite Straight Line Alternate Click the reason b = a = a 109∘ b b = a = c 80∘ a 12∘ d = c = b d b = a = b d c d = c = a 143∘ a = b = c = 103∘ c a b |