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jdi 13^2=12^2+x^2
169=144+x^2
x^2=25
x=akar 25
x=5
kan ada 2 segitiga siku2 jdi 2*5 =10
CD=AB- 10
= 25 -10
= 15
dan karna 5 itu persegi, maka, sisinya sama panjang. jadi jawabnya 5