Discussion

Explanation:

If two chords intersect internally as shown in the figure, 

DX × CX = AX × BX;

∴ AX = (6 × 8)/4 = 12 cm

AB = AX + BX = 12 + 4 = 16 cm

AB is the diameter of the circle. 

∴ Radius AO = 16/2 = 8 cm

Hence, option (c).

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