Kasih tau cara ama jawaban pleaseee

1. Perbandingan :
x/3 = 14/(3+4)
x/3 = 14/7
x/3 = 2
x = 6 cm
Panjang ST = 6 cm

2. Sisi yg sama :
Diket :
Kiri = kanan
18 = 12
12 = 8
x = 6
Maka :
18/12 = x/6
3/2 = x/6
18/2 = x
x = 9

Maaf jika ada kesalahan :)