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14. A rectangular strip, 16 cm x 3.5 cm is rotated about the longer side. Find the whole surface of the solid so generated.

Dear Student,


When the rectangle is rotated along the longer side, than it forms a cylinderof height equal to longer side and radius equal to shorter sideNow total surface area of cyclinder=2πrh+rgiven that longer side h=16cm and radius=3.5 cmHence total surface area=2×227×3.5×16+3.5=22×2×0.5×19.5=22×19.5=429

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