Two scuba divers, jim and tara, are 20m apart below the surface of the water. they both spot a shark that is below them. the angle of depression from jim to the shark is 47 degrees, and the angle of depression from tara to the shark is 40 degrees. how far is jim from the shark?

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2