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20 January, 19:57

The center of circle Q has coordinates (3, - 2). If circle Q passes through R (7, 1), what is the length of its diameter?

A. 50

B. 25

C. 10

D. 5

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Answers (1)
  1. 20 January, 20:51
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    The radius is |QR| = √ ((7-3) ² + (1 - (-2)) ²) = √ (16+9) = 5.

    The diameter is twice the length of the radius: 2*5 = 10.

    The appropriate choice is ...

    C. 10
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