20 circular plates each of radius 7cm and thickness 1.5 cm are placed one above the other to form a solid right circular cylinder. Find the total surface area of of cylinder so formed [tsa of cylinder =2pie r (h+r) , area of circle = pie r^2 ]
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total surface area of cylinder=2pi.r^2+2pi.r.h
where r=7cm
h=1.5 x 20=30 cm
now,
total surface area =2 x 22/7 x 7 {7+30}
=44 x 37 =1628 cm^2
where r=7cm
h=1.5 x 20=30 cm
now,
total surface area =2 x 22/7 x 7 {7+30}
=44 x 37 =1628 cm^2
akhilrockzzz:
U did it right thank u
ok
Answered by
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2πr(h+r) = 2×22÷7(7+1.5×20)
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