Two circles of radii $5.5$ cm and $4.2$ cm touch each other externally. Find the distance between their centres.

19.4 c m

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9.7 c m

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8 c m

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None of these

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Solution

The correct option is A $9.7 c m$
For circles touching externally,
distance between centres $=$ sum of radii
$\Rightarrow$ $C_{1} C_{2}$ $= 5.5 + 4.2 + 9.7 c m .$

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