Python Number atan2() Method


Python number method atan2() returns atan(y / x), in radians.


Following is the syntax for atan2() method −

atan2(y, x)

Note − This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.


  • y − This must be a numeric value.

  • x − This must be a numeric value.

Return Value

This method returns atan(y / x), in radians.


The following example shows the usage of atan2() method.

import math

print "atan2(-0.50,-0.50) : ",  math.atan2(-0.50,-0.50)
print "atan2(0.50,0.50) : ",  math.atan2(0.50,0.50)
print "atan2(5,5) : ",  math.atan2(5,5)
print "atan2(-10,10) : ",  math.atan2(-10,10)
print "atan2(10,20) : ",  math.atan2(10,20)

When we run above program, it produces following result −

atan2(-0.50,-0.50) :  -2.35619449019
atan2(0.50,0.50) :  0.785398163397
atan2(5,5) :  0.785398163397
atan2(-10,10) :  -0.785398163397
atan2(10,20) :  0.463647609001
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