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 ​

Answer 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.