#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	return 0;
}

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1. #include <stdio.h>
2. #define PI 3.14
3.
4. int main() {
5. float radius, area, circumference;
6.
7. // Input
8. printf("Masukkan jari-jari lingkaran: ");
9. scanf("%f", &radius);
10.
11. // Proses
12. area = PI * radius * radius;
13. circumference = 2 * PI * radius;
14.
15. // Output
16. printf("Luas lingkaran: %.2f\n", area);
17. printf("Keliling lingkaran: %.2f\n", circumference);
18.
19. return 0;
20. }