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      Question

      A circle has radius 13 cm. A chord is 10 cm long. What

      is the perpendicular distance from the centre to the chord?
      A 12 cm Correct Answer Incorrect Answer
      B 10 cm Correct Answer Incorrect Answer
      C 18 cm Correct Answer Incorrect Answer
      D 21 cm Correct Answer Incorrect Answer

      Solution

      Perpendicular from centre bisects chord. Half of chord = 10/2 = 5 cm Using right triangle: distance2  + 52 = 132 distance2 = 169 - 25 = 144 distance = 12 cm

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