Radians (Rad) =/= Gradians (Grad)Whoever said that 90 degrees equals 100 gradians and that the scientific community doesn't use it better be joking. For clarification, 90 degrees equals pi/2 gradians and the scientific community most definitely uses gradians because you can't use degrees in calculus.
90 Degrees = pi/2 Radians = 100 Gradians