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sudut CAB = sudut CAD (berimpit)
sudut BCA = sudut ADC = 90 derajat
sudut ABC = sudut ACD
(sudut, sudut, sudut)
b) BC = √(AB² - AC²) = √(16² - 12²) = √112 = 4√7
AD/AC = AC/AB
AD/12 = 12/16
AD/12 = 3/4
AD = (12 x 3)/4 = 36/4 = 9