Răspunsuri

2014-04-28T16:58:31+03:00
Din ΔADC cu D=90⇒DC²=AC²-AD²=400-144=256
DC=16 atunci DB=BC-DC=21-16=5cm
AB²=AD²+DB²=25+144=169
AB=13 cm
aaa .... bine :)
bafta
DB=25 ?
nu 5
am scris nu are cum 25 ca totBC are 21