find l when theta is 60 degrees and r is 4.5cm??

Answer 1

You have to be more specific.
What is l ?

Answer 2

hmmm. hard to say what you want, but
(4.5,60°) translates to 4.5cis60° = 4.5*√3/2 + 4.5*1/2 i = 3.90+2.25i

Answer 3

Can you be more specific