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A=45 de grade
B=75 grade
BC=4 grade
Raza cercului circumscris?


Răspuns :

75 GRADE+45 GRADE+2 GRADE=122

deci <C=60 grade
AC/sinB=BC/sinA=2R(teorema sinusului)
4/sin45=2R⇒8/√2=2R⇒R=4/√2⇒R=2√2