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300 = 1/2 . 24 . BD
BD= 300 : ( 1/2 . 24)
BD = 300 : 12
BD =25
OB²= 20² - 12² = 400 - 144 = 256
OB =16
OD = BD - OB=25-16
OD = 9cm
AD² = (1/2AC)² + OD²= 12² + 9²
AD² = 144 + 36
AD = √180
AD =6√5