Where does DEz=8333N(5/15) come from in this calculation?

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boyongo
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Im having trouble understating this:

The last part:

DEz=8333N(5/15) where does this come from?

15m is the height and 5m is the base of the triangle.
 

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It's the horizontal component of DE i.e FDEcosθ
where cosθ = Opposite/Adjacent = (15/5)
 
but isn't cosine adjacent/Hypotenuse?
 

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