A satellite is 112 miles above the earth, and the angle A to the horizon is 77degree . The radius of the earth is ______ miles Solution Here we will apply sine ratio sin(77) = radius/(112+radius). 0.9743=r/(r+112) 0.9743(r+112) = r 0.9743r+109.129 =r 0.0257r =109.129 r= 109.129/0.0257 r= 4246.26 miles.