Answer :

Since DE || BC and AB acts as transversal.

So, ADE = ABC {corresponding angles}


since ABC = 40°


So, ADE = 40°


Since EF || AB and DN acts as transversal.


So, ADE = MEN {corresponding angles}


MEN = 40°


Hence, ADE + MEN = 80°


(ii) 140°


Since AB represents a straight line. Sum of angles in line AB = 180°


So, BDE + ADE = 180°


since, ADE = 40°


So, BDE = 140°


(iii) 140°


Since DE || BC and FM acts as transversal.


So, EFC = MEN = 40°


And BC represents a straight line. Sum of angles in line BC = 180°


= EFC + BFE = 180°


= BFE = 140°


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