A rectangular strip of dimensions 21 cm ? 7 cm is rolled along the longer side . Find the volume of the solid thus generated.

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Answer: Volume of solid that generated is 81.31 cm³.
Step-by-step explanation:
Since we have given that
Length of rectangular strip = 21 cm
Width of rectangular strip = 7 cm
Since a rectangular strip is rolled along the longer side i.e. 21 cm
So, Height of cylinder becomes 21 cm
Circumference of base of cylinder = 7 cm
As we know the formula for "Circumference of circle":
So, Volume of cylinder is given that
Hence, Volume of solid that generated is 81.31 cm³.
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