9. A rectangular strip 25 cm x 7 cm is rotated about the longer side. Find the volume of
the solid, thus generated.
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s=274.40cm^2
Step-by-step explanation:
=2pir
25=2×22/7×r
r=25×7/44
r=3.977cm
let the height h=7cm
volume of cylender v=pir^2h
v=22×3.977×3.977×7/7
v=347.96cm^3
surface area s=2pir(h+r)
s=2×22×3.977/7(7+3.977)
s=44×3.977×10.977/7
s=1920.84/7
s=274.40cm^2
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