Tolong yaa no. 28 & 29

nomor 28

luas juring OBC

120/360πr² = 60

1/3πr² = 60

πr² = 180

luas juring AOC

152/360 πr²

= 152/360 × 180

= 152/2

= 76 cm²

nomor 29

ACB = ½ AOB

ACB = ½×50

ACB = 25°