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Angles are often used in function expressions.

So, sometimes angles need to be converted between degrees (˚) and radians.

- Degrees to Radians
- Radians to Degrees


We know that the conversion is very simple.

We just need to multiply π/180 (= 0.0174533) to convert degrees to radians

if we need to convert radians to degrees , we need to multiply 180/π (= 57.2958). 

degrees to radians

radian = degree * 0.0174533

radians to degrees

degree = radian * 57.2958


RecurDyn provides very easy ways for angle conversion.

1. 2 constants, DTOR and RTOD

  • DTOR means Degrees to Radians. It is π/180 (= 0.0174533).
  • RTOD means Radians to Degrees. It is 180/π (= 57.2958)
    • You can multiply DTOR or RTOD appropriately.


2. Using a suffix, 'D'

  • 180D means 180 degrees.
  • 180D is used as 180*0.0174533 = π in RecurDyn expression
    • Please see No. 5 in the below image

With these 2 ways, you can easily use any angle unit between degrees and radians.


RecurDyn-Expression-Angle.jpg

Please refer to the above image.

It shows several examples of Degrees to Radians and Radians to Degrees.