Răspunsuri

2014-05-12T20:03:03+03:00
Daca OM perpendicular pe AB⇒ΔOMB dreptunghic si MB=2√3 si OB=4 
sin MOB=OM/OB=2√3/4=√3/2⇒MOB=60* si AOB=120*
L arc=2πR.α/360=π.4.120/180=8π/3
b) lungime arc mare=4π.240*/180=16π/3
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