Răspuns :
A(ABC) = AB×CD/2 = 16cm×4cm/2 = 32 cm²
- Ducem AE ⊥ BC
A(ABC) = AE×BC/2
32cm² = AE×8cm/2
64cm² = AE×8cm
AE = 64cm²/8cm
AE = 8 cm
A(ABC) = AB×CD/2 = 16cm×4cm/2 = 32 cm²
A(ABC) = AE×BC/2
32cm² = AE×8cm/2
64cm² = AE×8cm
AE = 64cm²/8cm
AE = 8 cm