Tolong di jawab no 29 beserta caranya

20=12 (sebangun)

AC=AD
20:16 = 12:AD (disamakan perbandingannya)
20:16 = 12:AD
20/10×6 : 16/10×6 =
12:9,6=12:AD
AD=9.6

AC^2 = CD × CB
256 = CD × 20
CD = 256 ÷ 20
CD = 12,8

AB^2 = BD × BC
144 = BD × 20
BD = 144 ÷ 20
BD = 7,2

AD^2 = CD × BD
AD^2 = 12,8 × 7,2
AD^2 = 92,16
AD = 9,6 ( b.)