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| Math Central | Quandaries & Queries |
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Question from maribie, a student: three discs are tangent externally distances between their centers are 23cm, 15cm, and 20cm. find their radii.t |
Maribie,
If two circles are tangent externally then the line segment joining their centres passes through the point of tangency.( Do you see why?) Thus the length of this line segment is the sum of the radii of the two circles.
Penny
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