10 : -
BC^2 = OB^2 - OC^2
BC^2 = 25 - 9
BC^2 = 16
BC = 4
Length of AB = 2(BC) = 2(4) = 8
11 : -
RS = PQ = 7
Because the chords will have same length if their midpoint bisector meet on the center of the circle.
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