Question 1189696
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Graph:
<img src = "https://i.imgur.com/kUSBRRu.png">
This is a right triangle with legs of
DE = 3
EF = 6
that represent the opposite and adajcent sides for the reference angle DFE (aka angle F)


Use the tangent ratio to connect those two sides
tan(angle) = opposite/adjacent
tan(F) = DE/EF
tan(F) = 3/6
tan(F) = 0.5


Then use the arctangent function, or inverse tangent *[Tex \large \tan^{-1}] to get
tan(F) = arctan(0.5)
F = arctan(0.5)
F = 26.56505
F = 26.57


Angle DFE is <font color=red>approximately 26.57 degrees</font>
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