Ruby | Math atan2() function

Last Updated : 12 Jul, 2025
The atan2() is an inbuilt function in Ruby returns angent inverse of (y/x), where y is the proportion of the y-coordinate and x is the proportion of the x-coordinate. The numeric value lies between –pi and +pi representing the angle theta of a (x, y) point and positive x-axis. It is the counterclockwise angle, measured in radian, between the positive X-axis, and the point (x, y).
Syntax: Math.atan2(y, x) Parameters: The function accepts x and y coordinates. Return Value: It returns returns a numeric value between –pi and +pi representing the angle theta of a (x, y) point and positive x-axis
Example 1: CPP 
#Ruby program for atan2() function

#Assigning values
y1 = 10 x1 = 10

    y2
    = 15 x2 = 10

#Prints the atan2() value
              puts Math.atan2(y1, x1)
                  puts Math.atan2(y2, x2)
Output: 
0.7853981633974483
0.982793723247329
Example 2: CPP 
#Ruby program for atan2() function

#Assigning values
y1 = 10 x1 = 5

    y2
    = 29 x2 = 17

#Prints the atan2() value
              puts Math.atan2(y1, x1)
                  puts Math.atan2(y2, x2)
Output: 
 1.1071487177940904
1.0405805540182667
Reference: https://devdocs.io/ruby~2.5/math#method-c-atan2Ruby
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