Because Pi = 180°, the general formula for degrees to radians is degrees * PI()/180. For example, to convert 45° to radians, the Excel formula would be 45*PI( )/180 which equals 0.7854 radians. More examples in the table below:
The Excel PI function returns the value of pi. For example, the formula =2*PI() * 3 returns the circumference of a circle with a radius of 3.
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