What am i supposed to type here tho, just look at the photo pls

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

If eh = hg and hg=16, find the diameter of k

*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