powierzchnia boczna walca po rozwinieciu jest kwadratem o boku 4pi .Oblicz objetosc walca

a = 4π H = a H = 4π Obwód pods = 4π Ob = 2πr 2πr = 4π |:π 2r = 4 |:2 r = 2 Pp = πr² Pp = π*2² Pp = 4π V = Pp*H V = 4π*4π V = 16π²