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Here are two circles. Their centers are A and F .

The first figure is a circle with center A and points E, C, B, and D lie on the circle. A line segment extends from A to point D and a second line segment extends from A to point C, where line segment AC is labeled 4 centimeters. A third line segment is extends from point E to point B, where line segment EB goes through point A. The second figure is a circle with center F and points H and G lie on the circle. A line segment is extends from point H to point G where line segment HG goes through point F and is labeled 8 centimeters.
What is the same about the two circles? What is different?
What is the length of segment A and D ? How do you know?

On the first circle, what segment is a diameter? How long is it?

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