Question

20 circular plates of 1 cm thickness are placed one above the other to form a solid the radius of each circular plate is 7 cm find the total surface area of the solid thus formed

Answer 1

Answer:

Step-by-step explanation:

TSA of cylinder =2$\pi$r(h+r)

$\pi$=22/7

r=7

h=20*1cm (Including the thickness of all plates)

2*22/7*7(20+7)

=1188$cm^{2}$

Answer 2

will take 22 by 7 because when the value of pi is not given then we take 22 by 7 it is a rule I hope u understand