Question

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Answer 1

@ashutoshrcf

Answer 2

Well first you need to find the arc length. Do you know how to find the arc length?

Answer 3

Same concept applies here lenght of arc will be \[l=r \theta\] =7pi(r)/4
And we know circumference of circle is 2pir so fraction is \[\frac{ 7\pi r/4 }{ 2\pi r }\] =7/8