How do you Convert the angle 225° to radians.
To convert from degrees to radians multiply by pi/180.
$${\frac{{\mathtt{225}}{\mathtt{\,\times\,}}{\mathtt{\pi}}}{{\mathtt{180}}}} = {\mathtt{3.926\: \!990\: \!816\: \!987\: \!241\: \!5}}$$
So 225° ≈ 3.927 radians
