Problem for calculating Sinus of a angle

[fxmaker]

Hello,

I try to get the sinus of the Rotation (Yaw) of a Spring arm.

In red → The angle of the SpringArm
In Green → The Sinus of the angle

but the problem is that the result does not correspond with the real sinus.
For Exemple the sinus of 20° is 0.34, but in this case, the sinus of 20° is 0.96, (you can see of this screenshot)

Someone can tell me how I can get the real sinus of that angle please ?

Thanks !

[fxmaker]

Its good I have found the problem. The angle must be convert to a Gradian angle !!
Thx