mr quinay made a cylindrical pencil holder it has a height of 5 in and diameter of 3 in how much material does she need to make a

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1. Step-by-step explanation:

   We know that the curved surface area of a right circular cylinder with radius r and height h is CSA=2πrh.

   It is given that the height of the pen holder is h=14 cm and the radius of the pen holder is 5 cm, therefore,

   CSA=2πrh=2×

   7

   22

   ×5×14=440 cm

   2

   Therefore, cardboard required for each student is 440 cm

   2

   .

   Also, it is given that total number of students in the class is 42,

   Therefore, total cardboard required for 42 students is:

   440×42=18480 cm

   2

   Hence, 18480 cm

   2

   cardboard was consumed.

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