tolong dibantu. ................

Dicari dulu AB dan DB nya pakai phytagoras
AB^2 = AC^2 - BC^2
AB^2 = 1600 - 576
AB = 32

DB^2 = CD^2 - BC^2
DB^2 = 25^2 - 24^2
DB^2 = 625 - 576
DB = 7

Maka panjang AD = AB - DB
AD = 32 - 7
= 25cm