a rectangular strip 25cm×7cm is rotated about the longer side find the volume of the solid thus generated
pls answer
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a rectangular strip 25cm×7cm is rotated about the longer side find the volume of the solid thus generated
pls answer
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The longer length of the rectangular strip =25cm become the circumference of the base of cylinder .
=2πr,
25=2x22/7xr
r=25x7/44
r=3.977cm
let the height h =7cm
volume of cylinder V = πr^2h
V=22x3.977x3.977x7/7
V=347.96cm³
surface area S =2πr( h+r)
S=2x22x3.977/7(7+3.977)
S=44x3.977x10. 977/7
S=1920.84/7
S=274.40 cm².
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