a rectangular strip of size 25 cm into 7 cm is rotated about the longer side find the volume and the whole surface area of the solid generated
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The longer length of the rectangular strip =25cm become the circumference of the base of cylinder
=2 pie r
25=2x22/7xr
r=25x7/44
r=3.977cm
let the height h =7cm
volume of cylinder V = pie r ^2h
V=22x3.977x3.977x7/7
V=347.96cm^3
surface area S =2pir( h+r)
S=2x22x3.977/7(7+3.977)
S=44x3.977x10. 977/7
S=1920.84/7
S=274.40 cm^2.
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