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Answer:

8

Step-by-step explanation:

Here,

C=pi d

c=3.4 d

or,25.12= 3.4d

or,25.12/ 3.4= d

So d= 8

Wikkyidn

Step-by-step explanation:

solution,

circumference of circle=25.12

R=? D=2r

D=? R=x

Now,

circumference of circle =2piR

or, 22.12 = 2×22÷7 × x

or, 25.12÷2 = 22÷7 × x

or, 12.56 = 22×7x÷7

or, 12.56×7 =22×7x

or, 87.92 = 22×7x

or, 87.92 - 22 = 7x

or, 65.92 =7x

or, x = 65.92÷7

X = 9.41

R = X

R = 9.41

lastly,

D = 2r

= 2 × 9.41

= 18.83

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