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Luas lingkaran jam = 22/7 × 21 cm × 21 cm = 1.386 cm^2
Luas juring = 120° / 360° × luas lingkaran jam
= 120° × 360° × 1.386
= 462
Jadi, luas juring lingkaran yang dimaksud adalah 462 cm^2 (D)