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Content of the notes (1)

There are many ways. I just use one for instance:

tg(35.8)=AB/BD

~0.72=AB/(BC+20)

Another time:

tg(50.5)=AB/BC

~1.21=AB/BC

So :

(0.72)(BC+20)=(1.21)(BC)

And BC=29.38

Now AC=BC/cos(50.5) Therefore AC=46.19

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