The Students Of A School Were Asked To Make And Distribute 100 Cylinderical Pen Holders Of Cardboard With Message "Do Not Use Plastic Bags" Printed On It. Each Pen Holders Was To Be Of Radius 3.5cm And Height  10cm. The School Had To Supply The Cardboards For This Work.
(A) How Much Cardboard Is Required?
(B) What Value Is Depicted In This Problem? (Use π= 22/7)