Distance Across River. An engineer wants to construct a bridge across a fast-mov
ID: 3191117 • Letter: D
Question
Distance Across River. An engineer wants to construct a bridge across a fast-moving river. Using a straight line segment between two points that are 100 feet apart along his side of the river, he measures the angles formed when sighting the point on the other side where he wants to have the bridge end. If the angles formed at points A and B are 64 degree and 16 degree respectively, how far is it from point A to the point on the other side of the river? Round to the nearest foot. The distance between point A and the point on the other side of the river is approximately feet.Explanation / Answer
third angle = 100 100/sin100 = AC/sin16 AC = 100*sin16/sin100 =27.99 m