The rear-view mirror of a car is so placed that its upper and lower edges are horizontal and its cener is at the same level as the center of the rear window. The driver's eye is also at this level, and the line of sight from his eye on the center of the mirror makes an angle of 30 degrees with the line joining the centers of the mirror and the window. The distance from his eye to the mirror is 2 feet, and that from the mirror to the window is 8 feet. What is the least width of the mirror is needed if the entire width (3 feet) of the rear window is to be seen? Would I do 3/8=x/2?