Solution:
Consider the following diagram
Here AB and CD are 2 parallel chords. Now, join OB and OD.
Distance of smaller chord AB from the centre of the circle = 4 cm
So, OM = 4 cm
MB = AB/2 = 3 cm
Consider ΔOMB
OB2 = OM2+MB2
Or, OB = 5cm
Now, consider ΔOND,
OB = OD = 5 (since they are the radii)
ND = CD/2 = 4 cm
Now, OD2= ON2+ND2
Or, ON = 3 cm.
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