I have another question to solve and it's answer should be 121sq. m
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The field is square shaped so the length of all the four sides is the same.
Let the side be x.
x^2 = 169
x = sq.root of 169.
Therefore x is equal to 13m.
The trench is said to be 2m wide and dug up on two sides of the field.
Therefore, the length of all the four sides decreases by two meter. (refer the diagram.)
The area = a^2
a = 13-2m = 11m
The area = 11×11 = 121sq.m.
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