The answer to your question is 0.469
The central angle corresponding to AOB is half of the 8pi/9 radians mentioned, meaning that the central angle of AOB is 4pi/9.
Converting that to degrees:
4pi/9 180 degrees
-------- * -------------------- = 80 degrees.
1 pi
The answer is... A
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The answer is 1A definitely
i believe it would be: 1/2y = x
y = 2.5