Ab is a chord of the circle with centre o oc is perpendicular ab if ac is 4 cm findab
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according to the theorem, "The perpendicular drawn from the center of any circle to any chord it bisects the chord at the point of intersection" so AB is the chord & OC is perpendicular from O(centre) i.e. C will be the midpoint of AB , so AB=2×(AC) , AB=2×4=8cm
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