Solution
Let the length of the side of the square field = $$a$$
Given, the area of the square field = $$7200 m^2$$
$$=$$> $$a^2=7200$$
$$=$$> $$a=60\sqrt{2}$$
$$\therefore\ $$Length of the diagonal of the square field = $$\sqrt{2}a$$ = $$\sqrt{2}\left(60\sqrt{2}\right)$$ = 120 m
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