Mathematics
Two circles of radii 5 cm and 2.8 cm touch each other. Find the distance between their centres if they touch
(i) Externally
(ii) Internally
Circles
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Answer
(i) From figure,
OC = OP + PC = 5 + 2.8 = 7.8 cm
Hence, the distance between centres of circle = 7.8 cm when circles touch externally.
(ii) From figure,
OC = OP - CP = 5 - 2.8 = 2.2 cm.
Hence, the distance between centres of circle = 2.2 cm when circles touch internally.
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