Răspunsuri

2014-07-09T13:51:02+03:00
NQ//BC⇒Th Thales DN/DB=DQ/DC=NQ/BC
15-QC/15=NQ/9=2NB/3NB
15-QC/15=2/3
45-3QC=30
15=3QC
QC=5⇒DQ=15-5⇒DQ=10
NQ/9=2/3
NQ=9*2/3=18/3=6
A ΔDQN=DQ*QN/2( triunghiul este dreptunghic in Q)
A=10*6/2=30
6 4 6