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berjari jari 5 = π × r × r = 3,14 × 5 × 5 = 78,5
berjari jari 15 = π × r × r = 3,14 × 15 × 15 = 706,5
jika kedua punya angka dibelakang koma maka kita hilangkan komanya dgn mengkalikan 10 pada masing² luas
78,5 × 10 = 785
706,5 × 10 = 7065
perbandingan 785 : 7065 = 157 : 1431
selisih nya = 706,5 - 78,5 = 628
*smoga membantu