Question

56 circular plates each of radius 5 centimetre and thickness 0.25 centimetres are placed one above another to form a solid right circular cylinder find csa and volume

Answer 1

formed cylindrical solid height =56x (0.25)=14cm
now
cross section area =pi.r^2=25pi cm
volume =pi.r^2.h=pi.(25)(14)=350pi cm^2

Answer 2

In the Cylinder Formed
h = (0.25×56) = 14cm
r = 5 cm

l^2 = h^2+r^2
l^2 = (14×14)+(5×5)
l = √221

CSA = πrl
= 22×5×√221/7
= (110/7)×√221
= 233.60 cm^2

Volume = πr^2h
= 22×5×5×14/7
= 22×25×2
= 1100 cm^3

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hope this helped ......