excel - Angle of rotation for a data label along a line on a chart -

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i have chart plots flow vs power. want adjust rotation of data label sits on top of line on chart match slope of line. first point plotted @ 25000, 87000; second point plotted @ 53000, 182000. if manually count gridlines , tangent(theta) = opposite / adj answer makes sense ~22º if use actual data graph angle wrong. eyeballing graph, looks 22º using plot data gives me 73º.

it seems confusing opposite , adj. 73º right answer these data.

you have 2 points p1 = (x1, y1) , p2 = (x2, y2).
segment p1p2 has slope angle (in radians) 

a = atan2(y2 - y1, x2 - x1)

(i don't know exactly, whether atan2 or arctan2 function exists in vba math library - a discussion found)


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