If two circles touch internally, then the distance between their centres is equal to the [[1]] of their radii.

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answer is DIFFERENCE.

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Detailed Solution

If two circles touch internally, then the distance between their centres is equal to the difference of their radii.
Given that, two circles are touched internally by one another.
If two circles touch each other internally, then the distance of the centres of both the circles is equal to their respective radii from the point of contact.
Therefore, to find the distance between the centres of the circles, the radius of the smaller circle is subtracted from the radius of the larger circle.
Hence, if two circles touch internally, then the distance between their centres is equal to the difference of their radii.
Therefore, the correct answer is difference.

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