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


If the circles touch each other externally, distance between their centres is equal to the sum of their radii.
We have r1 = 5.5 and r2 = 4.2
Distance between their centres = 5.5 +4.2 = 9.7 cm

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