Chloe wants to ride a zip line. She looked online and found a zip line tour near her home, and she needs to decide whether to ride the Beginner's zip line or the Daredevil's zip line. The tour company's Web page gives some of the measurements for the two zip lines, but Chloe wants to find some additional measurements before she decides. The image below is shown on the tour company's Web page. Daredevil's zip line 500 ft Beginner's zip line 420 ft 20° I 1. Chloe printed the image and added labels to help her identify sides and angles. Describe how to find BC, the difference in the heights of the starting points. B Daredevil's zip line 500 ft Beginner's zip line 420 ft 20° A D