tolong jawab dengan caranya nomor 26

Kelas 8 Matematika
Bab Unsur Lingkaran

OA = 2 AB

OB = 18 cm
OA = (2/3) . 18
OA = 12 cm

Luas ABCD
= luas juring OBC - luas juring OAD
= (105°/360°) . π . (ra - rb)²
= (7/24) . (22/7) . (18 - 12)²
= (22/24) . 36
= 33 cm²