What measurements do you measure a human

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).

Which phrase generalizes the specific terminology bolded in the text?