Question

A diameter of a wheel of a cycle is 70 cm. What is the distance travelled in 21 revolutions?​

Answer 1

Answer:

diameter = 70 = 70/2 = 35 (radius)

according to question :-

circumference = 2πr = 2*22/7*35 = 225 cm

now one revolution = 225cm

so 21 revolutions = 225 *21 = 4725cm

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Answer 2

Answer:

Distance covered in one revolution= Circumference of the circle= 2πr

= πd

= 22/7 × 70 cm = 220 cm

Distance covered in 21 revolutions = 220× 21 cm = 4620 cm ----(Ans)...

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