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Question

A wheel of radius 4π cm touches a flat surface, and the corresponding point of contact is A. Now the wheel rolls on the flat surface till the point A lies vertically above the corresponding point of contact in this position as shown. What is the distance covered by the centre of wheel? (Denoted by X)


A
4 cm
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B
8 cm
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C
2 cm
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D
6 cm
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Solution

The correct option is B 4 cm
 

Now we know that r=4πcm
Circumference = 2πr=2×π×4π=8cm
Distance covered = 12×circumference=12×8=4cm

Mathematics

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