The ATAN function returns the inverse tangent (arctangent) of a number.
ATAN(num)
num: A number value.
Notes
The ATAN function takes a tangent and returns the corresponding angle, expressed in radians in the range –π/2 to +π/2 (–pi/2 to +pi/2). To see the resulting angle in degrees instead of radians, wrap this function in the DEGREES function; that is, =DEGREES(ATAN(num)).
Examples |
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=ATAN(1) returns the angle measure 0.785398163397448 radians (45 degrees), which has a tangent of 1. =DEGREES(ATAN(1)) returns 45. |