Whats the area of the surface where you can score 1 pointers? Sorry for the drawing did my best, thats all information you have. http://gyazo.com/98959dbd8ba263fe56cd58091f7192d9
Would it be (20^2*3,14) - (15^2*3,14) = answer? Because surface of whole, (20^2x3,14) and then subtract with surface of whole excluding 1 pointers (15^2*3,14) to see the gap which means the surface is that big.
