Tolong ya, sebisanya aja. Terimakasih

14) ACB = 60°
AOB = 60 x 2 = 120°
120°/360° = 1/3
1/3 x 22/7 x 21 x 21 = 462 cm² [ C ]

16) 120°/3 = 40°
40° x 2 = 80° [ C ]

18) keliling lingkaran = πd
= 1/2 x 22/7 x 7 = 11 x 2 (setengah lingkarannya ad 2) = 22 cm
22 + 12 + 12 = 46 cm [ B ]

maaf kalo salah tolong bantu saya mengoreksi nya ^^