Прошу,очень срочно!!!

1 fotka: [latex]Sin \alpha= \frac{a}{12} [/latex] [latex]Sin30= \frac{a}{12} [/latex] [latex] \frac{1}{2}= \frac{a}{12} [/latex] [latex]a=6[/latex] [latex]Cos \alpha = \frac{b}{12} [/latex] [latex]Cos30= \frac{b}{12} [/latex] [latex] \frac{ \sqrt{3} }{2}= \frac{b}{12} [/latex] [latex]b=6 \sqrt{3} [/latex]