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Problema de geometrieVa rog mult am mare nevoie.
Coroana +19 puncte


Problema De GeometrieVa Rog Mult Am Mare NevoieCoroana 19 Puncte class=

Răspuns :

Daca mC=30° inseamna ca mA=90°-30°=60°
in ∆BDC dreptunghic :
cosA=cos60°=AD/AB=4/AB=1/2
AB=8cm
din Pitagora vom avea BD=√(8²-4²)=√4•12=4√3cm
In ∆BDC dreptunghic
sinC=sin30°=BD/BC=4√3/BC=1/2
BC=8√3cm

cosC=cos30°=DC/BC=DC/8√3=√3/2
DC=12cm

AC=DC+AD=12+4=16cm
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