1. Suppose that BC is hypotenuse, then by Pythagorean theorem: . 2. If BC is not hypotenuse, then BC is a leg and AC is hypotenuse (because AC>AB). Hence by Pythagorean theorem: .
SA=4pir^2 c=2pir so c=30 30=2pir divide 2 15=pir divide by pi 15/pi=r sub
SA=4pir^2 SA=4pi(15/pi)^2 SA=4pi(225/pi^2) SA=900/pi squaer feet if use pi=3.141592 SA=286.47889756541160438399077407053 square feet or about 286 square feet