Answer :

Let us consider trapezium PQRS with PQ||RS.


According to the problem, it is given that P = 700and Q = 800.



We know that the sum of adjacent angles between two parallel lines is 1800.


i.e, P + S = 1800 ...... - - (1)


Q + R = 1800. ...... - (2)


Substituting the value of P in eq(1) we get,


700 + S = 1800


S = 1800 - 700


S = 1100.


Substituting the value of Q in eq(2) we get,


800 + R = 1800


R = 1800 - 800


R = 1000.


The values of S and R is1100 and 1000.


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