SQL Server RADIANS() Function

Convert a degree value into radians:

SELECT RADIANS(180);

Definition and Usage

The RADIANS() function converts a degree value into radians.

RADIANS( number)

Parameter	Description
number	Required. A number in degrees

Works in:	SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Convert a degree value into radians:

SELECT RADIANS(-45);