The Excel ATAN2 function returns the arctangent from the x and y coordinates of a point. In geometric terms, the function returns the radian angle corresponding to the coordinates of the input point. If you imagine a ray starting from the origin of the coordinate system and extending outwards, every point along the ray will return the same angle value. A circle of radius one demonstrates all possible return values for the function.

**Syntax**: =ATAN2(x_num, y_num)

The ATAN2 function syntax has the following arguments:

- X_num (Required): The x-coordinate of the point.
- Y_num (Required): The y-coordinate of the point.

**Example**: Let’s look at some Excel ATAN2 function examples and explore how to use the ATAN2 function as a worksheet function in Microsoft Excel:

**Syntax**: =ATAN2(F11,G11)

**Result**:

Based on the Excel spreadsheet above, the following ATAN2 examples would return:

**Syntax**: =ATAN2(F12,G12)

**Result**: 0.321750554

**Syntax**: =ATAN2(F13,G13)

**Result**: 0.643501109

**Syntax**: =ATAN2(F14,G14)

**Result**: 1.047184849

**Syntax**: =ATAN2(F15,G15)

**Result**: 1.352127381

**Syntax**: =ATAN2(F16,G16)

**Result**: 1.373400767

**Syntax**: =ATAN2(F17,G17)

**Result**: 1.768191887

**Syntax**: =ATAN2(F18,G18)

**Result**: 2.077894831

**Syntax**: =ATAN2(F19,G19)

**Result**: 2.498091545

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