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buatlah segitiga ATC
AT = 12
AC = 8√2
TC = 12
misal DC = x
AT² - DT² = AC² - CD²
144 - (144 - 24x + x²) = 128 - x²
144 - 144 + 24x - x² = 128 - x²
24x = 128
x = 16 / 3
AD² = (8√2)² - (16/3)²
AD² = 128 + 256/9
AD² = 1408/9
AD = (8√2)/3 <------- HASIL AKHIR