Question 186129
πR^2h - πr^2h=(3.14*50^2*4)-(3.14*10^2*4)=31400-1256=30144
.
πR^2h - πr^2h 
=pi*h(R^2-r^2)
=3.14*4(2500-100)
=12.56*2400
=30144
.
Ed