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clear
//
//
//
//Variable declaration
D4=0.4 //diameter of 4th ring(cm)
D12=0.7 //diameter of 12th ring(cm)
p1=16
p2=8
n=4
//Calculation
x=n*p1/(n*p2)
D20=sqrt((D4**2)+(x*((D12**2)-(D4**2)))) //diameter of 20th dark ring(cm)
//Result
printf("\n diameter of 20th dark ring is %0.3f cm",D20)
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