tolong dibantu y!! sekalian caranya

BD^2 = 25 × 9
BD^2 = 225
BD = 15

AB^2 = BD^2 - AD^2
AB^2 = 15^2 - 9 ^2
AB^2 = 225 - 81
AB^2 = 144
AB = 12

Maafkan saya, tolong lanjutkan sendiri, ty.