Butuh cepat, pake cara ya

AB = AC = x
BC = 24 cm

[tex]BC^2=AB^2+AC^2 \\ \\ 24^2= x^2+x^2 \\ \\ 24\times24= 2x^2 \\ \\ x^2= \frac{24}{2}\times24 \\ \\ x^2=12\times24 \\ \\ x^2=288 \\ \\ x= \sqrt{288} [/tex]

Jadi, panjang AB = AC = √288...........Jawaban (D)

***Semoga Terbantu***