Answer:
B. 6.4
Step-by-step explanation:
We need to recall the theory of the chord distance to the center which tells that the two congruent chords are equidistant from the center of the circle.
In this situation, A is the center point, CR and BE are congruent with the length of 5,27. So, the distance from A to CR must be equal to the distance from A to BE. Hence, the length of the blue segment in A below is 6.4
Hope it will find you well.
