void main() { float r,a,c; printf("\nEnter the radius of circle:\t"); scanf("%f",&r); a=PI*r*r; printf("\nThe area of the circle:\t%f",a); c=2*PI*r; printf("\nThe circumference of the circle: %f",c); }

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Output Enter the radius of circle: 2 The area of the circle: 12.568000 The circumference of the circle: 12.568000 Enter the radius of circle: 1 The area of the circle: 3.142000 The circumference of the circle: 6.284000

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