Question

Please help me solve triangle ABC (sine/cosine theorem) if there is:

b + c = 20 ; a = 5*sqrt(2) , γ = 135°

Answer 1

if \[\alpha + \beta + \gamma = 180 ° \]
how to find b and c through sine theorem? \[\frac{ a }{ \sin \alpha } = \frac{ b }{ \sin \beta } = \frac{ c }{ \sin \gamma }\]
There is no alpha or beta angles.