The Excel SIN function is fundamental when we want to find the sine of an angle in radians. We need to multiply the angle given by PI()/180 so that we can get it in degrees. We can also use the RADIANS function to convert it into radians. This article provides an **overview of the Excel SIN function**.

*Figure 1: Overview of Excel SIN function *

**General syntax of the formula**

**=SIN(number)**

Where;

**Number-**refers to the angle for which we want to find the sine. It has to be in radians.

**Understanding the formula**

- For us to use the Excel SIN function, we first need to convert the angles given to radians.
- Supplying the angles to radians can be done by either multiplying the angle by PI()/180 or using the excel RADIANS function.
- In our example in figure 1 above, we have used the RADIANS function to get the angle in radians.
- Below is another example of how you can use PI()/180 to get the same result;

**=SIN(30*PI()/180)** - This is as shown in row 5 in figure 1 above.

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