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4 A roll of paper is shown below.

Tube

About how much cardboard is needed to make the inner tube for a roll of paper if the tube

has a diameter of 4.5 cm and is 24 cm long?

F 339 cm2

G 679 cm2

H 371 cm2

J

382 cm2

Sagot :

fichoh

Answer:

339 cm²

Step-by-step explanation:

Using the relation for the surface area of a cylinder :

A = 2πrh

r = Radius = diameter / 2 = 4.5 / 2 = 2.25 cm

Height, h = 24 cm

A = 2 * 22/7 * 2.25 * 24

A = 339.29200 cm²

Surface Area =339 cm²

About 339cm³ of cardboard will be needed for the inner tube.

ashishdwivedilVT

To make inner tube card board needed is 339 cm² of the material.

What is Surface area ?

The surface area of a solid object is a measure of the total area that the surface of the object occupies.

Here, diameter = 4.5 cm

then, radius = 4.5/2 = 2.25 cm

          height = 24 cm

Surface area = 2πrh

                       = 2 X 3.14 X 2.25 X 24

                       = 339.12 cm²

Thus, to make inner tube card board needed is 339 cm² of the material.

Learn more about Surface area from:

https://brainly.com/question/2835293

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