C# - Math Atan2() Method

The C# Math Atan2() method returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta). The return value will be in the range -𝜋 through 𝜋. In special cases it returns the following:

• If either argument is NaN, the method returns NaN.
• If any of the arguments are either PositiveInfinity or NegativeInfinity, the method returns NaN.

Syntax

```public static double Atan2 (double y, double x);
```

Parameters

 `y` Specify the ordinate coordinate. `x` Specify the abscissa coordinate.

Return Value

Returns theta of the point (r, theta) in polar coordinates that corresponds to the point (x, y) in Cartesian coordinates.

Example:

In the example below, Atan2() method is used to calculate the theta of a point.

```using System;

class MyProgram {
static void Main(string[] args) {
Console.WriteLine(Math.Atan2(10, 10));
Console.WriteLine(Math.Atan2(20, 10));
Console.WriteLine(Math.Atan2(-20, 10));
}
}
```

The output of the above code will be:

```0.7853981633974483
1.1071487177940904
-1.1071487177940904
```

❮ C# Math Methods

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