1) Insufficient
2) Insufficient

1+2 ) From area we can find radius \(= 9\).
From the length of arc we can find angle of \(AOB\) (\(O\) is the center of angle)
Angle = Length of arc / Circumference * 360 degrees \(\Rightarrow \frac{7\pi}{18\pi} * 360 = 140 degrees\)

Angle \(OBA = 20\) degrees
Angle \(OBC = 90\) degrees
So we can infer that angle \(ABC = 70\) degrees
Ans as triangle \(CBA\) is isosceles we can infer that \(x = 40\) degrees