# Friction angle - radians or degrees

Asked by
Piotr Klejment
on 2019-03-05

Hello!

Following the title of the post, I would like to ask if a friction angle is in radians or degrees?

Thank you and regards!

## Question information

- Language:
- English Edit question

- Status:
- Solved

- Assignee:
- No assignee Edit question

- Solved by:
- Dion Weatherley

- Solved:
- 2019-03-06

- Last query:
- 2019-03-06

- Last reply:
- 2019-03-05

Dion Weatherley (d-weatherley) said : | #1 |

Hi Glaubiger,

To my knowledge ESyS-Particle interaction groups do not use friction angle per se as an input parameter. BrittleBeamPrms has a "tanAngle" parameter to define the friction angle but this should be supplied as the tangent of the angle e.g. 45 degrees equates to tanAngle=1.0.

BTW, Python assumes radians by default when using trigonometric functions in the math library. The math library has degrees(..) and radians(..) subroutines to easily convert between the two.

Cheers,

Dion

Piotr Klejment (glaubiger) said : | #2 |

Thanks Dion Weatherley, that solved my question.

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