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If two circles touch each other internally, the distance between their centers?

If two circles touch each other internally, the distance between their centers? Correct Answer Distance between their centers is differences of their radii.

Calculation:

Let center of two circles are C1 and C2 and radius are r1 and r2.

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From figure C1T = r1 and C2T = r2

C1C2 = C1T - C2T

∴ C1C2 = r1 - r2

Circles touching each other internally: If the two circles are touching each other internally then the distance between their centers is differences of their radii.

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