The diameter of a circular plate is 28 cm and its thickness is 2.5 cm . 20 such plates are stacked vertically to

make

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1. Answer:

   5632cm^2

   Step-by-step explanation:

   given diameter(d)=28cm,

   radius(r)=d/2=28/2=14,

   thickness(t)=2.5cm

   and for 20 such plates are vertically stacked to form a cylinder, the height of the cylinder(h)=20*2.5=50cm

   now,total surface area of cylinder(tsa)=2[tex]\pi[/tex]r(r+h)

   tsa=2(22/7)14(14+50)

   after calculation,we get 5362cm^2

   I hope the answer helps you

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