What is a rhombus with no right angles then

Me answer number 3plz explain how you do it

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

*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