The theory involved.1. the tangent circle is perpendicular to the RADIUS at the disappointing experience.2. from some outside circles. Drag the tangent circle have two lines of equal length. And support at the Center as well.3. circle the two circles touch. Contact with the center point of the circle, both reputations on the same straight line.4. the angle of the tangent lines to the resulting from the end of the record, the experience shall equal to the angle of a circle that lies opposite.
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