Analogy — Geometric figure and characteristic segment: Circle : Diameter :: ? : ? Select the pair that mirrors “figure : its standard connecting segment”.

Introduction / Context:
A circle is associated with its diameter as a characteristic straight-line segment. For a rectangle, the comparable characteristic segment is its diagonal.

Concept / Approach:
Maintain “figure → its internal connecting segment” symmetry.

Why Other Options Are Wrong:

• Diameter : Radius — Reverses role (segment-to-segment), not figure-to-segment.
• Square : Rectangle — Figure-to-figure relation.
• Bisector : Angle — Operator-to-object, reversed direction.
• None of these — invalid since a correct pair exists.

Final Answer:
Rectangle : Diagonal