Two circles touch each other internally. The greater circle

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Two circles touch each other internally. The greater circle has its radius as 6 cm and the distance between the centres of the circles is 2 cm. The radius of the other circle is

1. 3 cm.
2. 4 cm.
3. 2 cm.
4. 5 cm.

Correct Option: B

As per the given in question , we draw a figure of two circles touch each other internally ,

Given , OA = 6 cm.
OO' = 2 cm.
∴ O'A = OA – OO' = 6 – 2 = 4 cm.