tolong dijawab no. 8 dan 9 ya? terima kasih

1. a. CB = 16 cm + 4 cm = 20 cm
AC = √20 cm x 4 cm
AC = 4 cm x 2 cm = 8 cm

b. AB = √(CB xCD)
AB = √ 20 cm x 16 cm
AB = 4 cm x 14 cm = 56 cm

c.