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18,84 cm²= 60°/360° × 3,14. r²
18,84 cm² = 1/6 × 3,14. r²
18,84 cm² × 6/1 = 3,14 × r²
113,04 cm² =3,14 × r²
r² = 113,04/3,14
r² = 36
r = ✓36
r = 6cm
jadi, jari jari lingkaran adalah 6 cm.
semoga bermanfaat. Dicek kembali