tolong jawab ini ya pakai cara nya

[tex]BC = \sqrt{ 12^{2} + 9^{2} } = \sqrt{144 + 81} = \sqrt{225} = 15 \\ \\ Maka \\ \frac{QR}{PQ} = \frac{BC}{AB} \\ \frac{QR}{12} = \frac{15}{18} \\ QR = \frac{15x12}{18} \\ QR = \frac{180}{18} \\ QR = 10 cm [/tex]

Jawabannya B