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प्रश्न
If two circles with radii 8 cm and 3 cm respectively touch externally, then find the distance between their centres.
योग
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उत्तर
`"l"("C"_1"C"_2) = "r"_1 + "r"_2` = 8 + 3 = 11
If two circles touches externally then distance between their centres is equal to sum of the radii.
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