We need to be able to convert radians to degrees and vice versa. Below you can enter radians as decimal approximations, but I recommend that you enter arithmetic expressions like pi/2 for $\frac{\pi}{2}$. I trust that you can compute a decimal value on your calculator if required. However, if you do enter a decimal approximation compute and enter at least four digits. WeBWorK will consider your value correct if it is within one tenth of one percent of the answer that it has been told. In this problem WeBWorK will tell you for each answer whether it's right or wrong, in the next problem you will have to get everything right before getting credit.
$90^\circ =$ rad
$60^\circ =$ rad
$73^\circ =$ rad
$-567^\circ =$ rad
Hint: Everything follows from the fact that $$360^\circ = 2\pi \hbox{~rad}.$$