QQuestion
Two circles of diameter 5 cm and 7 cm touch each other internally, the distance between their centres will be –
(a) 1 cm
(b) 2 cm
(c) 3 cm
(d) 4 cm
Two circles of diameter 5 cm and 7 cm touch each other internally, the distance between their centres will be –
(a) 1 cm
(b) 2 cm
(c) 3 cm
(d) 4 cm
(a) 1 cm
Explanation:
Radii are 5\over2 = 2.5 cm and 7\over2 = 3.5 cm.
For internal contact,
Distance between centres = difference of radii
= 3.5 − 2.5
= 1 cm.
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