Question

a rectangular sheet of 88cm ×45 cm is rolled along its length the form a cylinder find the CSA of the cylinder ​

Answer 1

Answer:

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 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×  

7

22

​  

×r

⇒r=  

2×22

44×7

​  

=7

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=πr  

2

h=  

7

22

​  

×(7)  

2

×20=  

7

22

​  

×49×20=3080 cm  

3

 

Hence, the volume of the cylinder is 3080 cm  

3

.

Answer 2

Answer:

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Step-by-step explanation: