Question: If the equation of the small right circle in Fig. 21.39 is x 2 + y 2 = a 2 , what is the equation

If the equation of the small right circle in Fig. 21.39 is x² + y² = a² , what is the equation of the large circle? (Circles are tangent as shown with centers on the x-axis; the small circles are congruent.)

Fig. 21.39.

y X

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