Talk:Tangent lines to circles

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Mathematics rating:
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 Field: Geometry

Inner/Outer Tangents[edit]

Could these be rolled into a single section, with a single diagram? TallNapoleon (talk) 06:03, 1 October 2008 (UTC)

Tangent lines to two circles, error.[edit]

The section Tangent lines to two circles starts with the assertion the in general two circles have four common tangents. Actually, there are either 0, 2 or 4 lines depending on whether one is inside the other, the circles intersect, or they lie outside each other.--RDBury (talk) 02:53, 26 July 2009 (UTC)

Diagram mismatch for Thales' theorem tangents construction[edit]

There is something wrong in the subsection "Geometrical constructions" of section "Tangent lines to one circle". When the text explains that Thales' theorem may be used to construct the tangent lines, the point Q is defined as "the midpoint of the line segment OP". However, in the corresponding diagram Q is obviously not at the mentioned midpoint. (Actually, the figure description gives a different definition for Q.) —Preceding unsigned comment added by 150.164.3.97 (talk) 00:51, 30 July 2010 (UTC)