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Cine raspunde corect dau coroana​

Cine Raspunde Corect Dau Coroana class=

Răspuns :

DE⊥AC

DE inaltime in triunghiul ADC

DE²=AE•EC

DE²12•48 = 576

DE = 24

DA²=AC²·AE

DA²=12·60=720

DA=12√5

AB²=AC²-BC²=60²-(12√5)²==3600-720=2880

AB=24√5

A-aria

A=AB·BC=24√5·12√5=1440

Sper ca te-amajutat