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In two concentric circles of radii 10 cm and 6 cm, a chord of the larger circle touches the smaller circle. How long is this chord? (answer in cm)

Competition practiceGeometry
  • A16
  • B8
  • C12
  • D20

Step-by-Step Solution

The radius to the point of contact is perpendicular to the chord and bisects it. Half-chord = √ cm, so the chord = 16 cm.
Answer: A) 16

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