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aflati aria triunghiuluiABCC stiind ca AB= AC=4 si A 60 grade

Răspuns :

AΔ=AB·AC·sin60/2
AΔ=4cm·4cm·√3/2/2
AΔ=16√3/2/2
AΔ=4√3cm²⇒aria ΔABC;