The longest chord is the diameter

This type of question, asked 2 times: 23 Sep 2024 S2, 14 Sep 2025 S3. All 2 questions below, oldest first.

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Question 1
23 Sep 2024 S2
67 $The distance between the longest chord and the centre of a circle is:$
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Question 2
14 Sep 2025 S3
74 $The diameter of a circle measures 25 cm. What is the maximum length of a chord in this circle?$
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