Răspuns:
Explicație pas cu pas:
a) p - semiperimetru
P = 2*p
P= 2*7.5 = 15cm
b) AB = 8cm
BC = 1 dm = 10 cm
CA = 50mm =5 cm
P = AB + BC + CA = 8 + 10 + 5 = 23 cm
c) AB = 16cm
[tex]BC = \frac{3}{4} * AB = \frac{3*16}{4} = \frac{48}{4} = 12 cm[/tex]
[tex]AC = \frac{AB+BC}{2} = \frac{16+12}{2} = \frac{28}{2} = 14 cm[/tex]
P = AB + BC + CA = 16 + 12 + 14 = 42 cm
