Answer:
The choice third ; a=9 , c= 18
Step-by-step explanation:
[tex] \sin(60) = \frac{9 \sqrt{3} }{c} \\ \\ c = 18 [/tex]
[tex] \tan(30) = \frac{a}{9 \sqrt{3} } \\ \\ a = 9[/tex]
