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The centres of the circles & the point of contact are collinear.
Two circles touching internally at C.
A & B are the centres.
AC= AB+ BC (Betweenness property)
AB is the distance between the centres.
AC = 8 units (radius of the larger circle)
BC= 3 units ( radius of the smaller circle)
AC-BC= AB
8–3 = AB
5 = AB
Ans: The distance between the centres of the given circle is 5 units.
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