Function

Atan(number) number

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Use

The Atan() function returns the arctangent of a given unitless number. The result is given in radians, but it can be converted to degrees using "to deg".

Atan() will always return an angle in the 1st and 4th cartesian quadrants. So, when using negative numbers, it can be important to use Atan2.

Atan() also works with complex numbers.

Examples of trig arc functions

• Acos(pi/4)  = .667 rad
• Acos(0.5) to deg  = 60 deg
• Atan(3ft/5ft)  = 0.540 rad
• Asin(-1 + 2i)  = (-0.427 + 1.529 i) rad

 

 

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