tolong dijawab no.1 & 2 pakai caranya

Bab Kesebangunan
Matematika SMP Kelas VII

1] x / (x + 4) =4 / 5
5x = 4 (x + 4)
5x = 4x + 16
5x - 4x = 16
x = 16 cm

2] AD = √(BD x CD)
AD = √(8 x 18)
AD = √144
AD = 12 cm