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Homework Statement
A plane initially flies south at a velocity of 480 km/h. Aided by a wind, the groundspeed is 528 kmh at 15 degrees east of south.
Calculate the windspeed and the direction of it
The Attempt at a Solution
I got the magnitude of 139.9 km/h but for the angle I Don't know if the angle is down below the horizontal or above the horizontal.