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AC²=CD²-AD²
AC²=15²-9²
AC²=225-81
AC²=144
AC=12
AB²=BC²-AC²=20²-12²=400-144=256
AB²=16
DB=AB-AD
DB=16-9=7
Eh maaf.. Itu 7 cm hehe
Maaf, aku enggak tahu cara no 18