In the triangle ABC, the angle a is equal to 120 degrees, the angle c is equal to 10 degrees, and the angle AB is equal to 12 Make a list of formulas, thank you Be sure to be more detailed In the triangle ABC, the angle a is equal to 120 degrees, the angle c is equal to 10 degrees, and the angle AB is equal to 12 to find BC

First of all, the problem is solved by the sine theorem
Sine theorem: A / Sina = B / SINB = C / sinc = 2R (R is the radius of ABC circumcircle of triangle)
According to the theorem: BC / sin120 ° = AB / sin10 °
And ab = 12
Ψ BC = 6 radical 3 / sin10 °≈ 59.85

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