Solve 20 points? (a) Through what angle does Tarzan need to swing? see the statement below
(b) How far vertically above the river banks does the top of the
vine need to be so that Tarzan doesn’t get eaten by
crocodiles on the river?

Tarzan is swinging over a river on a vine that is 30m long, with
its banks elevated above the river. The banks of the two sides of
the river are level and the top of the vine is attached to a point
exactly halfway across the river. If the river is 50m wide: