cos^2 5+cos^2 10+cos^2 80+cos
^2 85
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The sides of the quadrangular field taken in order are 26,27,7,24m respectively. The angle contained by the last 2 sides is a right angle. ... So, the diagonal of a right angled triangle will be the third side of the normal triangle. So, calculate the third side using Pythagoras theorem as √AD2+CD2=AC.
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