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AB2 + AD2 = BD2
12^2 + 9^2 = x^2
144 + 81 = x^2
225 = x^2
BD = 15cm
B.CG=DH =8
DH2 + BD2 = HB2
8^2 + 15^2 = X2
64 + 225 = X^2
289 = x^2
HB = 17 cm