RADIANS function

Use the RADIANS function to convert an expression or a host variable representing a number of degrees to the equivalent number of radians.

The return value is a number of type DECIMAL (32, 255).

The degree_expression that is the only argument to this function must have a numeric data type (or a non-numeric data type that can be converted to a number) that the database server evaluates in units of degrees, and converts to units of radians:

EXECUTE FUNCTION RADIANS (100);
EXECUTE FUNCTION RADIANS ("100");

In both of the examples above, the RADIANS argument evaluates to 100 degrees, and the return value is 1.745328251994 radians. You can use a RADIANS function expression as the argument to the COS, SIN, or TAN function to return the respective trigonometric values for that angle:

COS(RADIANS (100))
SIN(RADIANS ("100"))
TAN(RADIANS (100))

The RADIANS function converts degrees to radians according to the following formula:

(number of degrees) * (pi/180) = (number of radians)

Here pi represents the ratio of the circumference of a circle to its diameter. Results of arithmetic calculations that use the transcendental number pi as the dividend of a rational number always include rounding error.