If two circles touch each other internally then the distance between their centres is equal to _____?
Answer: Difference of their radius
Explanation
If two circles touch internally, the distance between their centers is the difference of their radii: r₁ - r₂.
r₁ is the radius of the larger circle, and r₂ is the radius of the smaller circle.
If the sum of the radii equals the distance between the centers, the circles touch externally.
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