Answer :

According to the problem it is given that,


R = 1250 and P and Q are supplementary angles.


We know that, the sum of supplementary angles equals to 1800.


So, P + Q = 1800.


We know that the sum of all angles in a quadrilateral is 3600.


So, P + Q + R + S = 3600.


Substituting the values and conditions we obtain,


1800 + 1250 + S = 3600


3050 + S = 3600


S = 3600 - 3050


S = 550.


The value of S is550.


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