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Luas B.S. = Luas Lingkaran
s^2 = 3.14 × r^2
r^2 = s^2 / 3.14
r = s / (3.14)^1/2
r ÷ s = 1 ÷ (3.14)^1/2
Ya kira kira sisi bujur sama radius ( jari-jari ) lingkaran perbandingannya harus segitu dah.