75 degrees
. In the given figure, are the lines a and b parallel? Justify your answer.
125 degrees
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no a and b are not parallel as if we take angle c as a linear pair for 125° ,the answer would be 55° and not 75° . but for the lines to be parallel , corresponding angles should be equal and in this case they are not , i.e., 75° not equal 55°
hence proven .
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