Locus of the midpoints of radii or equal chords of a circle: a concentric circle

1. A.
   $\frac{3r}{2}$
2. B.
   $\frac{2r}{3}$
3. C.
   $\frac{2\sqrt{3}r}{3}$
4. D.
   $\frac{\sqrt{3}r}{2}$

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1. A.
   A concentric circle of radius 8 cm
2. B.
   A concentric circle of radius 16 cm
3. C.
   The diameter of the circle
4. D.
   A straight line passing through the centre of the circle

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