Răspunsuri

2014-04-28T14:50:59+03:00
Suma unghiurilor unui tr =180 
A+B+C=180
90+60+C=180
c=30 grade
laturile se afla cu th lui Pitagora
BC²=AB²+AC²
sau trigonometrie
sin B=cateta opusa/ipotenuza
sin 60=1/BC⇔√3/2=1/BC
CB=2√3/3
atunci in Pitagora⇒
4/3=AB²+1
AB²=4/3-1=1/3
AB=√3/3