Răspuns:
OA=OB=r=12
AB=12
OA=OB=AB => OAB tr. ech. => <AOB=60=arc<AB
Fie OC perpendicular pe AB, C pe AB
OC=sqrt(144-36)
OC=sqrt(108)
OC=6sqrt(3)
Aria OAB = 6sqrt(3)*12=72sqrt(3)/2=36sqrt(3)
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Răspuns:
OA=OB=r=12
AB=12
OA=OB=AB => OAB tr. ech. => <AOB=60=arc<AB
Fie OC perpendicular pe AB, C pe AB
OC=sqrt(144-36)
OC=sqrt(108)
OC=6sqrt(3)
Aria OAB = 6sqrt(3)*12=72sqrt(3)/2=36sqrt(3)