perhatikan gambar dibawah ini! please help me

Mapel : Matematika
Bab : Lingkaran

K1 = phi × d
K1 = 22/7 × 14
K1 = 44 cm

K2 = phi × d
K2 = 22/7 × 28
K2 = 88 cm

K arsir = K2 - K1
K arsir = 88 - 44
K arsir = 44 cm

(a)