tolong bantuin no 1 sama no 2 dong plis bantuin

1. Panjang BC =
8/8+4 = 6/BC
8/12 = 6/BC
8 BC = 72
BC= 9 cm

2. Panjang = 4 cm
Lebar = 6 cm
Diperbesar 2 x
Panjang = 4 x 2 = 8 cm
Lebar = 6 x 2 = 12 cm
Keliling = 12+12+8+8 = 40 cm

Maaf kalo salah :)