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A circle with centre A and radius 9 is tangent to a smaller circle with centre D and radius 4. Common tangents EF and BC are drawn to the circles making points of contact at E, B, and C as shown. Determine the length of EF.

A Circle With Centre A And Radius 9 Is Tangent To A Smaller Circle With Centre D And Radius 4 Common Tangents EF And BC Are Drawn To The Circles Making Points O class=

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