| **Navigation:**  [[introduction.htm|Language Reference]] > 13 - Built-in Functions >====== SIN (return sine) ====== | [[shutdown  arm termination procedure .htm|{{btn_prev_n.gif|Previous page}}]][[introduction.htm|{{btn_home_n.gif|Return to chapter overview}}]][[skip  bypass records in sequence .htm|{{btn_next_n.gif|Next page}}]] |
|  ||

**SIN(**//radians//**)**

{{blk2blue.jpg|blk2blue.jpg}}

| **SIN** | Returns sine. |
| //radians// | A numeric constant, variable or expression for the angle expressed in radians. p is a constant which represents the ratio of the circumference and radius of a circle. There are 2p radians (or 360 degrees) in a circle. |

The **SIN** procedure returns the trigonometric sine of an angle measured in //radians//. The sine is the ratio of the length of the angle's opposite side divided by the length of the hypotenuse.

**Return Data Type:     **REAL

**Example:**

**PI        EQUATE(3.1415926535898)     !The value of PI**

**Rad2Deg   EQUATE(57.295779513082)     !Number of degrees in a radian**

**Deg2Rad   EQUATE(0.0174532925199)     !Number of radians in a degree**

** CODE**

** Angle = 45 * Deg2Rad                 !Translate 45 degrees to Radians**

** SineAngle = SIN(Angle)               !Get the sine of 45 degree angle**

**See Also:**

[[tan  return tangent .htm|TAN]]

[[atan  return arctangent .htm|ATAN]]

[[asin  return arcsine .htm|ASIN]]

[[cos  return cosine .htm|COS]]

[[acos  return arccosine .htm|ACOS]]