Length of internal common tangent of two circles (given distance between centers and radius)

Formula

Length of internal common tangent of two circles (given distance between centers and radius) formula
L
length of internal common tangent
d
distance between centers of two circles
R
radius of one circle
r
radius of another circle

Formula description

A line that is tangent to two circles in the same plane is a common tangent. A common internal tangent is a common tangent that intersects the segment that joins the center of the two circles.

Calculator (how to use calculator?)

Length of internal common tangent of two circles (given distance between centers and radius) formula
d
R
r
L
Precision

Formula code

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References

  1. wikipedia: Tangent lines to circles.
  2. Wikipedia: Circle.

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