Răspuns:
Explicație pas cu pas:
1.
P=AB+AC+BC=24 AB+BC=24-6=18 AB+BC=18
AC²=BC²-AB²=36 (BC-AB)(AB+BC)=36 BC-AB =2
......................
2BC=20 BC=10 cm
AB=8 cm
2.
MN linie mijlocie=AC/2 ⇒AC=2MN=2x5=10cm
AB=6 cm BC=8 cm
folosin formula Heron
A=√p(p-a)(p-b)(p-c) unde p=(a+b+c)/2=(10+6+8)/2=12
A=√12×2×6×4=√2²×3×2×2×3×2²=√2^6×3² A=2³×3=24 cm²
A=AB×AC/2=8×6/2=24 cm²
