Sпол=\pi(R^2+(R+r)l+r^2)=\pi(30^2+(30+20)26+20^2=2600\pi
Vус.к.=\frac{1}{3}\pi h(R^{2}+R*r+r^{2})
h=\sqrt{26^{2}-10^{2}}=24
V=
