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Two Circles Touching Internally and Externally

Two circles w...

Question

Two circles with radii $4 c m$ and $3 c m$ touch each other externally. Find the distance between their centres.

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Solution

Two circles touch externally.

The distance between their centres $= r_{1} + r_{2}$

$= r_{1} + r_{2}$

$= 4 + 3$

$= 7 c m$

The distance between their centres is $7 c m$ .

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