What is the angle between v = (5,8) and the positive x-axis?

If we draw a line through the point (5,8), we form an angle that has an adjacent side of equal to 5 and an opposite side equal to 8. If we let x be the unknown angle, the trigonometric function that can be used for this item is,
                                       tan x = opposite / adjacent
                                      tan x = (8/5)
The value of x from the equation is 57.99 or 60°.

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