Beri penjelasanya ya teman ,,sedih gabisa ngerjain soal kaya gini :(

pasar - stadion =
[tex] \sqrt{ {18}^{2} - {9}^{2} } = \sqrt{ {9}^{2} ( {2}^{2} - {1}^{2} ) } =9 \sqrt{3} [/tex]
mis. pasar - sekolah = a, maka :
[tex] \frac{a}{9 \sqrt{3} } = \frac{9 \sqrt{3} }{18} \\ a = \frac{81 \times 3}{18} = \frac{27}{2} = 13.5[/tex]