The second angle of a triangle is three times as large as the first. the third angle is 20 degrees less than the sum of the other two angles. find the measure of the first angle.

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.