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= ¼ × π × d
= ¼ × 22/7 × 7 × 2
= ¼ × 22 × 2
= ¼ × 44
= 11 cm
K. ¼ Lingkaran Besar :
= ¼ × π × d
= ¼ × 3,14 × 10 × 2
= ¼ × 62,8
= 15,7 cm
Keliling daerah arsir :
= K.¼ Lingkaran Kecil + K.¼ Lingkaran Besar + (2 × Sisi arsir)
= 11 cm + 15,7 cm + (2×3cm)
= 11 cm + 15,7 cm + 6 cm
= 32,7 cm