Răspuns:
Aplici teorema sinusului
AB=c
c/sinC=2R
5/sin30°=2R
5/(1/2)=2R
10=2R
R=10/2=5
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BC=a
a/sinA=2R
a/sin45°=2R
a/(√2/2)=2R
2a/√2=2R
10√2=2R
R=10√2/2=5√2
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AC=b=2
b/sinB=2R
2/sin60°=2R
2/(√3/2)=2R║:2
√3/2=R
Explicație pas cu pas: