Asurveyor measures the distance across a straight river by the following method: starting directly across from a tree on the opposite bank, he walks 118 m along the riverbank to establish a baseline. then he sights across to the tree. the angle from his baseline to the tree is 36.0°. how wide is the river?

50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b.compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength