The figure shows the location of three points around a lake. the length of the lake, bc, is also shown. (the figure is not drawn to scale.) a picture of a right triangle abc with right angle at b is shown. the length of the side ac is labeled as 6 miles. the length bc of the triangle is labeled as 4 miles. this length bc is also the length of an irregular gray shaded shape. which of the following choices is closest to the distance (in miles) between points a and b? 3.16 miles 3.46 miles 4.47 miles 4.90 miles