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And the area between the 3 tangent circles (green area) is:
A = AT − AA − AB − AC
The angles of the triangle ABC can be found by cosine law:
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And the curvature of the circles k4 and k5 which are called the Soddy circles are:
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![]() ![]()
![]() NOTE: in all the calculations we assumed that r2 > r3
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