Question

The diameter of wheel of a cycle is 70 cm what distance traveled in 21 revolution

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: this is for  5 revolution

answer

Step-by-step explanation:

Distance covered will be=Number of revolutions × Circumference

Radius of wheel = 70/2=32cm

Distance covered in 5 revolutions will be

D=5 × 2n × 5 = 50n = 50 × 22/7= 157.14cm