Tangent - Tangent Circles

Tangent Circles

Two circles of non-equal radius, both in the same plane, are said to be tangent to each other if they meet at only one point. Equivalently, two circles, with radii of ri and centers at (xi, yi), for i = 1, 2 are said to be tangent to each other if

  • Two circles are externally tangent if the distance between their centres is equal to the sum of their radii.
  • Two circles are internally tangent if the distance between their centres is equal to the difference between their radii.

Read more about this topic:  Tangent

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