Mathematics · Mensuration

21 students prepared open cylindrical pen holders using cardboard. How much cardboard was used in total if each student made a pen holder of radius 4 cm and height 12 cm? (Take π = 22 7 )

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7392 cm 2

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21 students prepared open cylindrical pen holders using cardboard. How much cardboard was used in total if each student made a pen holder of radius 4 cm and height 12 cm? (Take &pi; = 22 7 )