# arctan2

## Calculates arctan(y/x) and returns an angle in
the correct quadrant.

**Syntax:**

arctan2(y, x);

Argument |
Description |

y |
The y coordinate to calculate. |

x |
The x coordinate to calculate. |

**Returns:** Real

### Description

This function returns the inverse tangent of an angle y/x, where
y = Opposite side of triangle and x = Adjacent side of triangle.
Unlike arctan(x) the function arctan2(y, x) is valid for all angles
and so may be used to convert a vector to an angle without risking
division by zero, and it also returns a result in the correct
quadrant.

**NOTE:** The value returned is in radians, not
degrees.

**Example:**

val = arctan2(1, 1);

This will set val to the correct angle, in this case 0.79.

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