greg and kristen are on opposite ends of a zip line that crosses a gorge. greg went across the gorge first, and he is now on a ledge that is 15 m above the bottom of the gorge. kristen is at the top of a cliff that is 72m above the bottom of the gorge. jon is on the ground at the bottom of the gorge, below the zip line. he sees kristen at a 65 degree angle of elevation and greg at a 35 degree angle of elevation. what is the width of the gorge to the nearest metre