Smart people help! Trignometric question. 1. The problem statement, all variables and given/known data A pedestrian bridge is build over a river. The angle of depression from one end of the bridge to a large rock beside the river is 37°. The distance from that end of the bridge (ptA) to the rock is 112m while the distance from the rock to the other end of the bridge(ptB) is 75m. Determine the length of bridge. 2. Relevant equations a^2=b^2+c^2-2bcCosA 3. The attempt at a solution I;m not sure about how to draw the diagram. The angle between the distance from the rock to A and the distance from the rock to B is 143° (180°-37°） I'm not sure about this.