1. points
Paulina wants to find the width, AB, of a river. She walks along the edge of the river 200 ft and marks
point C. Then she walks 60 ft further and marks point D. She turns 90° and walks until her location,
point A, and point Care collinear. She marks point E at this location, as shown.

(a) Can Paulina conclude that AABC and AEDC are similar? Why or why not?
(b) Suppose DE = 40 ft. Calculate the width of the river, AB. Show all your work and round answer
to the nearest tenth.