Sorry if its wrong but I believe that its 216√3 cm^2. really sorry if its wrong.
Answer:
160
Step-by-step explanation:
5x-10+12x=16x
17x-16x=10
x= 10
exterior angle at C = 16x= 16×10 = 160°
Answer:znmdzfhnnnnnncv
Step-by-step explanation: bvcxjcdjhdfnjdg