How do I add two polar form vectors?

[mattyd-]

it's a bit simple i know but i just forgot how to do it and i need to know its done for an exam next week...i just want to know how to add these two polar form vectors
8.54<69.44 + 4.123<14.036

 

[Defennder]

Convert them first to the form $$ai + bj$$.

Note that for a vector ai + bj, it may be represented in polar form with r = (magnitude of vector), and theta = arctan(b/a).