TINH CHU VI TAM GIAC CAN ABC BIET: a) AB=14CM,AC=6CM b)AB=5CM,AC=8CM c)AB=23CM,BC=11CM d)AB=15CM,AC=31CM

1 bình luận về “TINH CHU VI TAM GIAC CAN ABC BIET: a) AB=14CM,AC=6CM b)AB=5CM,AC=8CM c)AB=23CM,BC=11CM d)AB=15CM,AC=31CM”

1. a. P_{\DeltaABC}=2AB+AC=2*14+6=34 (cm)

   b. P_{\DeltaABC}=2AB+AC=2*5+8=18 (cm)

   c. P_{\DeltaABC}=2AB+AC=2*23+11=57 (cm)

   d. P_{\DeltaABC}=2AB+AC=2*15+31=61 (cm)

   ————

   P_{\DeltaABC}=AB+AC+BC

   Lại có AB=BC (\DeltaABC cân tại B)

   ⇒ P_{\DeltaABC}=AB+AB+AC=2AB+AC

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