I need help i really dont get geometry

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer

Can someone show me step by step how to do this?