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{ "quality": "incomplete", "question_count": 1, "skills_matched": [ "direct_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Radius of Circle" ], "new_concepts": [ "Circle Theorems" ], "current_concepts": [ "Radius of Circle", "Circle Definition" ] } ## Analyze the options and context $$ \begin{aligned} &\text{Options: A. radii, B. perpendicular, C. congruent, D. parallel} \end{aligned} $$ ## Identify the geometric definition $$ \begin{aligned} &\text{All radii of a circle are congruent.} \end{aligned} $$

A. radii

B. perpendicular

C. congruent

D. parallel

{ "subject": "Mathematics", "question_type": "Multiple Choice", "knowledge_point": [ "Mathematics", "Geometry", "Radius of Circle" ] }

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Question

Explanation:

Analyze the options and context

Identify the geometric definition

Answer: