Question

15. A rectangular sheet of paper 44 cm x 20 cm is rolled along its length to form a cylinder.Find the total curved surface area of the
cylinder so formed.​

Answer 1

Answer:

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 length of the rectangular sheet is l=44 cm and the height of the sheet is h=20 cm. Since the cylinder is formed among the length, therefore, length of rectangular sheet is equal to circumference of base that is:

$l=2πr$

$⇒44=2×722×r$

Therefore, the radius of the rectangular sheet is 7 cm.

We also know that the volume of a right circular cylinder with radius r and height h is V=πr ² h.

Here, the height is h=20 cm and the radius is r=7 cm, therefore,

$V=πr2h=722×(7)2×20=722×49×20=3080 cm3</p><p></p><p></p><p>$

Hence, the volume of the cylinder is 3080 cm ³

Answer 2

Answer:

answer is in the attachment

Step-by-step explanation:

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