Present the statement in the diagram as follows:
tan ϕ = Δy/Δx
A student bikes to school by traveling first dN = 0.900 miles north, then dW = 0.300 miles west, and finally dS = 0.200 miles south.
Finally, find ϕ, the angle north of west of the path followed by the bird.
Express your answer numerically in degrees.
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