Răspunsuri

2014-04-28T21:21:55+03:00
Pai... DC=144/9=16.Rezulta ca ac=25.BC=30 PRIN TEOREMA LUI PITAGORA IN TRIUNGHIUL BDC 

Si prin teorema lui Pitagora in triunghiul ABD obtii AB=15

P=15+25+30=60

2014-04-28T21:22:57+03:00
ΔABC, mas<B=90
BD²=AD*DC
144=9*DC
DC=16
AC=9+16=25
AB²=AD*AC
AB²=9*25
AB=√9*25
AB=√225
AB=15  

BC²=AC²-AB²= 25²-15²=625-225=400
BC=20
PΔABC=15+20+25=60