∆ + ∆ ……. = 180°
------------(i) angles in linear pair
……… + ∆ c = 180°
------------(ii) property of interior angles of parallel lines
…….. + …….. = ……. + ……….. ------------- from (i) and (ii)
∆ = ∆ b
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1) 60° + 60° + 60° = 180° is the correct answer..
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