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A rectangle of length 14 cm and breadth 7 cm is folded into a right circular cylinder. How many revolutions does the cylinder need to make to cover an area of 784 sq.Cm

Respuesta :

Answer:

n = 8

Step-by-step explanation:

Given that,

Length and breadth of a rectangle are 14 cm and 7 cm.

The area of rectangle is given by :

[tex]A=l\times b\\\\A=14\times 7\\A=98\ cm^2[/tex]

Let n be the number of revolutions the cylinder need to make to cover an area of 784 sq.cm.

So,

[tex]n=\dfrac{784}{98}\\\\n=8[/tex]

Hence, there are 8 revolutions.

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