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DB=AC
AC^2=BC^2+BD^2
6^2= x^2+(2x+1)^2
36=x^2+4x^2+4x+1
5x^2+4x-35=0
x=11,4 atau x= -15,4(tdak mungkin panjang bernilai minus)
BD= 2x+1= 2(11,4)+1= 23,8