Question

from point on horizontal ground a surveyor measures the angle of elevation of the top of a flagpole as18 degrees 40feets he moves 50meters nearer to the flagpole and measures the angle of elevation as degrees26
22feets.determine the height the height of the flagpole
draw a diagram
review your basic trig functions

now it is clear that you can find the height h using

h cot 18°40' - h cot 26°22' = 50
I didn't understand

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