Thus, the radius of each circle is 12 cm.ĪBCD is a parallelogram. Radius of circle with centre C 1 = Radius of circle with centre C 2 = Distance between their centres = C 1C 2 = 12 cm Let C 1 and C 2 be the centres of the two circles. Thus, the distance between their centres is 8.8 cm or 2.2 cm ∴ Distance between their centres = 5.5 cm − 3.3 cm = 2.2 cm If two circles touch each other internally, distance between their centres is equal to the difference of their radii. ∴ Distance between their centres = 5.5 cm + 3.3 cm = 8.8 cm If two circles touch each other externally, distance between their centres is equal to the sum of their radii. The radii of the two circles are 5.5 cm and 3.3 cm.
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