Ajutatima va rogg urgent...va rog frumos lamuritimi va rog..

Ajutatima Va Rogg Urgentva Rog Frumos Lamuritimi Va Rog class=

Răspuns :

AB= 12 cm(nr pitagorice)
AD=2/3 AB=8 cm
Aadc=AC*AD/2 = 9*8/2=36 cm^2
AB=(Pitagora in tr.dr ABC) =√(BC²-AC²)=√(15²-9²)=12

AD=2DB
AD+DB=AC
2DB+DB=12
3DB=12
DB=12:3=4
AD=2DB=2*4=8

aria tr. dr. ADC=cateta 1* cateta2/2=AC*AD/2=9*12/2=9*6=54 cm²
as simple as that!!