A surveyor on one side of a river wants to find the distance between points A and B on the opposite side of the river On her side she chooses points C and D which are 20 meters apart and measures the angles as shown in the figure below Find the distance between A and B in the most efficient way Show and label each step clearly A C B D mLACB 40 mzBCD 20 mLADC 45 mzADB 42 Call the intersection of the two diagonals point E This will make it easy to refer to the triangles