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30. mislkan , r Q = x
24² =26² - ( x -3 )²
576 = 676 - (x-3)²
576 - 676 = (x - 3)²
100 = (x - 3 ) ²
√100 = x - 3
10 = x - 3
10 + 3 = x
13 = x
jawabannya A
maaf kalo salah :)