Question

find the volume of a cylinder which is formed by revolving plastic sheet of dimensions 14cm ×7cm along its length

Answer 1

ACCORDING TO THE QUESTION
WE HAVE
CIRCUMFERENCE OF THE CIRCULAR BASE = 7 CM

SO, 2πR = 7
SO, RADIUS = 7×7/22×2 ==> 49/11 = 5CM (approximately )

SO, NOW WE HAVE
R = 5CM
H = 14CM

SO, VOLUME = π(R)^2H
= 7/22×5×5×14
= 1100CM^3

I HOPE THIS WILL HELP YOU.

Answer 2

circumference=2 pie r

14=2*22/7*r

r=14*7/44

r=98/44

r=3cm approximately

volume of cylinder=22/7*3*3*14

396 cm3