<em>See above information</em>
I am joyous to assist you anytime.
* Since you are in a hurry, check out this link for more information:
brainly.com/question/12725478?utm_source=android&utm_medium=share&utm_campaign=question
Answer:
a. 0.8727rad
b. 5.585rad
that should be correct, if not, i apologize T_T