### π Part 1: Introduce

#### π Definition

The RADIANS function in Microsoft Excel is designed to convert angles from degrees to radians.

#### π Purpose

The primary purpose of this function is to facilitate trigonometric calculations in Excel by converting angles to a format that can be easily used in trigonometric functions like SIN, COS, and TAN.

#### π Syntax & Arguments

The syntax for the RADIANS function is as follows:

syntax
`=RADIANS(angle) `

#### π Explain the Arguments in the Function

• Angle: This is the required argument. It represents the angle in degrees that you want to convert to radians.

#### π Return Value

The function returns the angle converted into radians.

#### π Remarks

The function is straightforward to use and has no specific limitations or conditions to be aware of.

### π Part 2: Examples

#### π Example 1: Converting Sales Angles for Data Visualization

##### π― Purpose of Example

To convert angles for a pie chart representing quarterly sales data.

##### π Data Sheet and Formulas
ABCDE
2Q12000090`=RADIANS(C2)`1.5708
3Q225000112.5`=RADIANS(C3)`1.9635
4Q31500067.5`=RADIANS(C4)`1.1781
##### π Explanation

In this example, we have quarterly sales data. The angles are calculated for a pie chart. We use the RADIANS function to convert these angles for trigonometric calculations that might be needed for advanced data visualization.

#### π Example 6: Calculating Adjusted Angles with IF Function

##### π― Purpose of Example

To adjust angles for a wind direction analysis, where angles greater than 180 degrees need to be halved.

##### π Data Sheet and Formulas
ABCDE
2North45`=IF(B2>180, B2/2, B2)``=RADIANS(C2)`0.7854
3South270`=IF(B3>180, B3/2, B3)``=RADIANS(C3)`2.3562
4West90`=IF(B4>180, B4/2, B4)``=RADIANS(C4)`1.5708
##### π Explanation

In wind direction analysis, angles greater than 180 degrees are often halved for normalization. We use the IF function to check if the angle is more significant than 180 degrees. If it is, we halve it; otherwise, we keep it as is. Then, we use the RADIANS function to convert these adjusted angles for further trigonometric analysis.

#### π Example 7: Summing Angles with SUM Function

##### π― Purpose of Example

To sum up the angles of a polygon and convert the sum to radians for geometric calculations.

##### π Data Sheet and Formulas
ABCDE
2Side 160`=SUM(B2:B4)``=RADIANS(C2)`1.0472
3Side 260`=SUM(B2:B4)``=RADIANS(C3)`1.0472
4Side 360`=SUM(B2:B4)``=RADIANS(C4)`1.0472
##### π Explanation

In geometry, the sum of the angles of a polygon is crucial for various calculations. Here, we use the SUM function to sum up the angles of a triangle. Then, we use the RADIANS function to convert this sum into radians for further geometric calculations.

#### π Example 8: Finding Angles with VLOOKUP Function

##### π― Purpose of Example

To find the angle associated with a given direction from a table and convert it to radians.

##### π Data Sheet and Formulas
ABCDE
2North0East`=RADIANS(VLOOKUP(C2, A2:B4, 2, FALSE))`0.0000
3East90
4South180
##### π Explanation

This example shows a table of directions and their associated angles. We use the VLOOKUP function to find the angle for a given direction (“East” in this case). Then, we use the RADIANS function to convert this angle into radians for further analysis.

#### π Example 9: Rounding Angles with ROUND Function

##### π― Purpose of Example

To round angles to the nearest integer before converting them to radians for simplified calculations.

##### π Data Sheet and Formulas
ABCDE
2Angle 145.6`=ROUND(B2, 0)``=RADIANS(C2)`0.7854
3Angle 230.4`=ROUND(B3, 0)``=RADIANS(C3)`0.5236
4Angle 360.7`=ROUND(B4, 0)``=RADIANS(C4)`1.0472
##### π Explanation

Sometimes, you might want to round angles to the nearest integer for simplified trigonometric calculations. We use the ROUND function to round the angles and then apply the RADIANS function to convert these rounded angles into radians.

#### π Example 10: Conditional Conversion with IFERROR Function

##### π― Purpose of Example

To safely convert angles to radians, return a default value if the conversion fails.

##### π Data Sheet and Formulas
ABCDE
2Angle 190`=IFERROR(B2, 0)``=RADIANS(C2)`1.5708
3Angle 2#N/A`=IFERROR(B3, 0)``=RADIANS(C3)`0.0000
4Angle 345`=IFERROR(B4, 0)``=RADIANS(C4)`0.7854
##### π Explanation

Sometimes, the data might contain errors or non-numeric values. Using the IFERROR function, we can handle such cases gracefully. A default value of 0 degrees is used if an error is found. Then, we use the RADIANS function to convert these error-free angles into radians.

#### π Example 11: Conversion Based on Lookup with INDEX-MATCH Function

##### π― Purpose of Example

To find and convert the angle associated with a specific month from a table using the INDEX-MATCH function.

##### π Data Sheet and Formulas
ABCDE
2January30March`=RADIANS(INDEX(B2:B4, MATCH(C2, A2:A4, 0)))`0.5236
3February60
4March90
##### π Explanation

This example shows a table of months and their associated angles. We use the INDEX-MATCH function to find the angle for a specific month (“March”). Then, we use the RADIANS function to convert this angle into radians for further analysis.

#### π Example 12: Conversion with Nested IF and AND Functions

##### π― Purpose of Example

To convert angles to radians only if they are within a specified range using IF and AND functions.

##### π Data Sheet and Formulas
ABCDE
2Angle 130`=IF(AND(B2>=30, B2<=90), B2, 0)``=RADIANS(C2)`0.5236
3Angle 2100`=IF(AND(B3>=30, B3<=90), B3, 0)``=RADIANS(C3)`0.0000
4Angle 360`=IF(AND(B4>=30, B4<=90), B4, 0)``=RADIANS(C4)`1.0472