Tarzan, a respected mathematician, comes to a rag

Tarzan, a respected mathematician, comes to a raging river while traveling in the jungle.In order to figure out hot to get across the river he wants to know its width.Tarzan locates a tree at point A directly across the river. He marks the spot and then walks 28 paces to point c where he pounds in a stake.Then he walks in addition 10 paces before turning perpendicularly to the river and walking until point C lines up with point A.This takes 14 peaces.What is the width of the river in paces?