Question

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

make a cylinder. Find the total surface area of this cylinder.​

Answer 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$\pi$r(r+h)

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

after calculation,we get 5362cm^2

I hope the answer helps you