Round off 0.043 to 1 significant figure

What is not true about kl and mn? what is mn? (show )

Me. i can't figure out this question. give an explanation too. .

*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