длина окружности цилиндра равна 18см а площадь осевого сечения 54см2 найдите объём цилиндра
Answers & Comments
maha3306
L = 2pi*r r = L/2pi r = 18/2pi = 9/pi d = 2r = 18/pi h = 54/18/pi = 3/pi Sосн = pi * r^2 = pi * (9/pi)^2 = 81/pi V = Sосн * h = 81/pi * 3/pi = 243/pi^2
Answers & Comments
r = L/2pi
r = 18/2pi = 9/pi
d = 2r = 18/pi
h = 54/18/pi = 3/pi
Sосн = pi * r^2 = pi * (9/pi)^2 = 81/pi
V = Sосн * h = 81/pi * 3/pi = 243/pi^2