Question:

If radii of two circles are 4 cm and 2.8 cm. Draw figure of these circles touching each other – (i) externally (ii) internally.

Answer:

(i)Circles touching externally

If the circles touch each other externally, distance between their centres is equal to the sum of their radii.
Distance between the centres = 4+2.8 = 6.8cm
(ii)Circles touching internally

The distance between the centres of the circles touching internally is equal to the difference of their radii.
Distance between the centres = 4-2.8 = 1.2cm

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