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BC = CD = √20² - 12² =√256 =16
LABC = LABC
AB . BC/2 = AC . OB/ 2 ...........(O titik potong diagonal AC dab BD, OB = OD)
12. 16/2 = 20. OB/2
OB = 12 .16/20 = 9,6 cm
panjang BD = 2OB = 2 .9,6 = 19,2 cm