Boris wants to measure the width of a river He marks off two right triangles as shown in the figure The base of the larger triangle has a length of 57 m and the base of the smaller triangle has a length of 31 m The height of the smaller triangle is 15 8 m How wide is the river Round your answer to the nearest meter The figure is not drawn to scale 57 m River 31 m 15 8 m m X 5