If the chord of a circle is equal to the radius of the circle,

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If the chord of a circle is equal to the radius of the circle, then the angle subtended by the chord at a point on the minor arc is

As per the given in question , we draw a figure a circle,

OA = OB = AB
∴ ∆ OAB is an equilateral triangle.
Hence, ∠AOB = 60°