25 circular plates, each of radius 10.5 cm and thickness 1.6 cm, are placed one above the other to form a solid circular cylinder. Find the curved surface area and the volume of the cylinder so formed.
Given that 25 circular plates each with radius 10.5 cm are stacked one above another and the thickness of each plate is 1.6 cm.
So, the height =1.6×25=40 cm
Now, volume of the cylinder =πr2h=227×10.5×10.5×1.6=13860 cm3
Curved surface area of the cylinder =2πrh=2×227×10.5×40=2640 cm2