Ruby | Math acos() function

Last Updated : 12 Jul, 2025
The acos() is an inbuilt function in Ruby which returns the inverse cosine of a number (argument) in radians. The value which is returned by the acos() function always lies between –pi to +pi.
Syntax: Math.acos(value) Parameters: This function accepts one mandatory parameter value which specifies the value whose inverse cosine should be computed. It must lie between -1 and +1, else a domain-error is thrown. Return Value: The function returns a numeric value between –pi and +pi. It is the counterclockwise angle which is measured in radian.
Example 1: CPP 
#Ruby program for acos() function

#Assigning values
val1 = 1 val2 = -1 val3 = 0.5 val4 = -0.7

#Prints the acos() value
                                      puts Math.acos(val1)
                                          puts Math.acos(val2)
                                              puts Math.acos(val3)
                                                  puts Math.acos(val4)
Output: 
0.0
3.141592653589793
1.0471975511965979
2.3461938234056494
Example 2: CPP 
#Ruby program for acos() function

#Assigning values
val1 = 0.8 val2 = -0.955 val3 = 0.74 val4 = -0.356

#Prints the acos() value
                                             puts Math.acos(val1)
                                                 puts Math.acos(val2)
                                                     puts Math.acos(val3)
                                                         puts Math.acos(val4)
Output: 
0.6435011087932843
2.8404561080364212
0.7377259684532488
1.9347802832764904
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