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

Question

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 pencil holder ​

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Reagan 3 months 2021-07-21T01:08:10+00:00 1 Answers 0 views 0

Answers ( )

    0
    2021-07-21T01:09:34+00:00

    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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