30 circular plates ,each of radius 14 cm and thickness 3cm. Are placed one above the other to form a solid . Find the total surface area of the solid formed .
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Height of the cylinder formed (h) = 30 x 3 = 90 cm
Radius of the base of the cylinder formed (r) = 14 cm
Total surface area of the cylinder = 2πr(r + h)
= 2 x 22/7 x 14(14 + 90)
= 2 x 22/7 x 14 x 104 = 9152 cm2
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Single Circular plate has a radius of 14cm
and 30 plates having each of thickness 3cm,so the total thickness is (30)(3)=90cm
it means the cylinder formed has radius 14cm and height 90cm.
so now,total surface of the solid or cylinder=2πr(r+h)
=2(22\7)(14)(14+90)
=9,152cm sq.
therefore,total surface area of the solid formed is 9,152cm sq.
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