Will someone answer brainlist goes your way

The polynomial function of least degree with a leading coefficient of 1 is: f(x) = x3 + ax2 + bx + c

*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

Which best explains why this triangle is or is not a right triangle ?