Теорема синуса полным ходом...[latex]1)\frac{BC}{sinA}=frac{AC}{sinB}=frac{AB}{sinC};frac{BC}{sin76^0}=frac{8}{sin48^0}=frac{AB}{sin56^0}\BC=8*sin76^0:sin48^0approx11,60\AB=8*sin56^0:sin48^0approx8,92[/latex][latex]2)\frac{BC}{sinA}=frac{AC}{sinB}=frac{AB}{sinC};frac{BC}{sin17^0}=frac{AC}{sin54^0}=frac{12}{sin109^0}\BC=12*sin17^0:sin109^0approx3,71\AC=12*sin54^0:sin109^0approx10,27[/latex][latex]3)\frac{BC}{sinA}=frac{AC}{sinB}=frac{AB}{sinC};frac{9}{sinA}=frac{8,95}{sin70^0}=frac{6}{sinC}\AC^2=BC^2+AB^2-2*BC*AB*cos70^0\ACapprox8,95\sinA=9*sin70^0:8,95approx0,94\angle Aapprox71\sinC=6*sin70^0:8,95approx0,62\angle C=39^0[/latex]