Circle geometry worksheet for identifying elements like radius and diameter.

To solve the problem, we need to identify the elements of each circle in the given diagrams. The elements we are looking for are:

1. Circle: The entire circular shape.
2. Radius: A line segment from the center of the circle to any point on the circle.
3. Diameter: A line segment passing through the center of the circle and connecting two points on the circle.

Let's analyze each diagram step by step:

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Diagram 1:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( K \) to the point \( M \) or \( N \).
- Diameter: The line segment passing through the center \( K \) and connecting the points \( M \) and \( N \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( KM \) or \( KN \)
- Diameter: \( MN \)

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Diagram 2:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( R \) to the point \( T \) or \( S \).
- Diameter: The line segment passing through the center \( R \) and connecting the points \( T \) and \( S \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( RT \) or \( RS \)
- Diameter: \( TS \)

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Diagram 3:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( A \) to the point \( C \) or \( D \).
- Diameter: The line segment passing through the center \( A \) and connecting the points \( C \) and \( D \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( AC \) or \( AD \)
- Diameter: \( CD \)

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Diagram 4:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( B \) to the point \( C \) or \( E \).
- Diameter: The line segment passing through the center \( B \) and connecting the points \( C \) and \( E \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( BC \) or \( BE \)
- Diameter: \( CE \)

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Diagram 5:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( G \) to the point \( F \) or \( H \).
- Diameter: The line segment passing through the center \( G \) and connecting the points \( F \) and \( H \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( GF \) or \( GH \)
- Diameter: \( FH \)

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Diagram 6:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( C \) to the point \( D \) or \( F \).
- Diameter: The line segment passing through the center \( C \) and connecting the points \( D \) and \( F \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( CD \) or \( CF \)
- Diameter: \( DF \)

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Diagram 7:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( O \) to the point \( P \) or \( Q \).
- Diameter: The line segment passing through the center \( O \) and connecting the points \( P \) and \( Q \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( OP \) or \( OQ \)
- Diameter: \( PQ \)

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Diagram 8:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( O \) to the point \( N \) or \( P \).
- Diameter: The line segment passing through the center \( O \) and connecting the points \( N \) and \( P \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( ON \) or \( OP \)
- Diameter: \( NP \)

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Diagram 9:

- Circle: The entire circle is labeled as "Circle."
- Radius: The line segment from the center \( O \) to the point \( Q \) or \( R \).
- Diameter: The line segment passing through the center \( O \) and connecting the points \( Q \) and \( R \).

Answer:
- Circle: \( \text{Circle} \)
- Radius: \( OQ \) or \( OR \)
- Diameter: \( QR \)

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Final Answer:

\[
\boxed{
\begin{array}{|c|c|c|c|}
\hline
\text{Diagram} & \text{Circle} & \text{Radius} & \text{Diameter} \\
\hline
1 & \text{Circle} & KM \text{ or } KN & MN \\
2 & \text{Circle} & RT \text{ or } RS & TS \\
3 & \text{Circle} & AC \text{ or } AD & CD \\
4 & \text{Circle} & BC \text{ or } BE & CE \\
5 & \text{Circle} & GF \text{ or } GH & FH \\
6 & \text{Circle} & CD \text{ or } CF & DF \\
7 & \text{Circle} & OP \text{ or } OQ & PQ \\
8 & \text{Circle} & ON \text{ or } OP & NP \\
9 & \text{Circle} & OQ \text{ or } OR & QR \\
\hline
\end{array}
}
\]