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π x 0,7² : π x 1,4²
0,7 x 0,7: 1,4 x 1,4
1 : 4
= 1/4×22/7×0,7×0,7
= 0,385 dm²
L. lingkaran 2 = 1/4πd²
= 1/4×22/7×1,4×1,4
= 1,54 dm²
Perbandingan luas lingkaran = L. lingkaran 1 : L. lingkaran 2
= 0,385 : 1,54
= 1 : 4