The pond

We can see the pond at an angle 65°37'. Its end points are 155 m and 177 m away from the observer. What is the width of the pond?

Correct result:

c =  180.8356 m

Solution:

a=155 m b=177 m  A=65+3760=39376065.6167  c=a2+b22 a b cosA=a2+b22 a b cos65.6166666667 =1552+17722 155 177 cos65.6166666667 =1552+17722 155 177 0.41284=180.836=180.8356 m

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