Ta có: A^=180∘−B^−C^=180∘−83∘−57∘=40∘
Áp dụng định lí sin: asinA=bsinB=csinC=2R
=> R=a2sinA≈106,96(cm)
=> b=2R.sinB=2.106,96.sin83∘=212,33cm
=> c=2R.sinC=2.106,96.sin57∘=179,41cm