Two wheels in a friction drive assembly are equal ellipses, as shown in Fig. 21.90. They are always in contact, with the left wheel fixed in position and the right wheel able to move horizontally. Find the equation that can be used to represent the circumference of each wheel in the position shown.

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y 0 1 1 1 +8.0 cm 6.0 cm Fig. 21.90 T T X