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AB = AD = (54 - 2(17))/2 = 10 cm
OB = √10² - 6²
OB = √100 - 36
OB = √64
OB = 8
BD = 2 x 8 = 16
OC = √17² - 8²
OC = √289 - 64
OC = √225
OC = 15
AC = 15 + 6 = 21
Luas = 1/2 (21)(16)
= 168 cm²