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- perbandingan keliling
= 3, 14 . 4 : 3,14 . 6
= 12,56 : 18,84
- perbandingan luas
= 3, 14. 2. 2 : 3, 14. 3. 3
= 12,56: 28, 26
a. perbandingan jari-jari
R1 : R2
2 : 3
b. perbandingan keliling
2 x x R1 : 2 x x R2
2 x x 2 : 2 x x 3
2 : 3
c. perbandingan luas
x R1 x R1 : x R2 x R2
2 x 2 : 3 x 3
4 : 9