1. 40*2=80
96-80=16
raspuns : 1 latura =40 cm , 2 latura =40 cm , 3 latura =16 cm
96-40=56
56:2=28
raspuns : 1 latura= 40 cm , 2 latura=28 cm , 3 latura = 28 cm
2. 84:2=42 ( semiperimetrul)
42-12=30 ( lungimea)
raspuns : lungimea = 30 cm
3. 180:2=90
90:5=18
18*2=36 ( latimea)
90-36=54 ( lungimea)