Question:

Two circles of radii \( 5 \, \text{cm} \) and \( 3 \, \text{cm} \) touch each other externally. Find the distance between their centres.

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For externally touching circles, the distance between their centres equals the sum of their radii.
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Solution and Explanation

Step 1: If two circles touch externally, the distance between their centres is equal to the sum of their radii: \[ \text{Distance} = R_1 + R_2. \] Step 2: Substituting \( R_1 = 5 \, \text{cm} \) and \( R_2 = 3 \, \text{cm} \): \[ \text{Distance} = 5 + 3 = 8 \, \text{cm}. \]
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