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L abd = a×t×1/2 = 14×12/2 = 84cm²
L abe = a×t×1/2 = 14×6/2 = 42cm²
L arsir = (L abc - L abe) + (L abd - L abe) = (126 - 42) + (84 - 42) = 84 + 42 = 126cm² (B)