Kayla wants to find the width of, AB, of a river. she walks along the edge of the river 200 ft and marks point C. Then she walks 45 ft further and marks point D. She turns 90 degrees and walks until her location, point A, and point C are collinear. She marks point E at this location as shown. Suppose De= 40 ft. What can Kayla conclude about the width of the river? (Round to the nearest 100th foot)