how do you convert degrees to radians?

I do it from scratch each time

$$\\180\;degrees=\pi radians\\ so\\ 1\;degree=\frac{\pi}{180\;}radians\\ so\\ x\;degrees=\frac{\pi}{180\;}\times x \;\;\;radians\\$$

how do you convert degrees to radians ?

see example:  http://web2.0calc.com/questions/convert-65-degrees-to-an-equivalent-number-of-radians