Răspunsuri

2014-04-21T13:41:59+03:00
Construiesti inaltimea BM
in triunghiul BMC, m M=90, mC=60⇒mB=30
notezi BC=x
conf th30-60-90, aplicand Pitagora⇒BC²=MC²+BM²
X²=(X/2)²+225
5X²=225*4
X²=45*4
X=18√5=BC