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The distance ...

Question

The distance between the centre of the two circles of radii $r_{1}$ and $r_{2}$ is d. they will touch each other internally if

A

d=

r_{1} - r_{2}

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B

d=

r_{1} + r_{2}

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C

d=

r_{2} - r_{1}

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D

d=

r_{2} + r_{1}

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Solution

The correct option is C d= $r_{1} - r_{2}$
$d = r_{1} - r_{2}$

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