Question: The figure shows two circles C and D of radius 1 that touch at P.T is a common tangent line; C1 is the circle that

The figure shows two circles C and D of radius 1 that touch at P.T is a common tangent line; C1 is the circle that touches C, D, and T; C2 is the circle that touches C, D, and C1; C3 is the circle that touches C, D, and C2. This procedure can be continued indefinitely and produces an infinite sequence of circles {C2}. Find an expression for the diameter of Cn and thus provide another geometric demonstration of Example 6.

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