no 1 ya dibantu tolong

Diketahui:
r = 2 cm, phi = 22/7
< AOB = 30° , < COD = 75°

K = 2 x phi x r
K = 2 x (22/7) x 2
K = 88/7

Jawab:
a. Panjang busur AB
Panjang busur AB = ( < AOB / 360° ) x Keliling Lingkaran )
Panjang busur AB = (30° / 360°) 88/7
Panjang busur AB = 1/12 x 88/7
Panjang busur AB = 88/84 cm

b. Panjang busur CD
Panjang busur CD = ( < COD / 360° ) x Keliling Lingkaran )
Panjang busur CD = (75° / 360°) 88/7
Panjang busur CD = (5 / 24) 88/7
Panjang busur CD = 440/168 cm