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JAMB Mathematics 2001 Question 29

Question 29

Coordinate Geometry

P(−6, 1) and Q(6, 6) are the two ends of the diameter of a given circle. Calculate the radius.

  1. A.3.5 units
  2. B.6.5 units
  3. C.7.0 units
  4. D.13.0 units
Show the answer and explanation

Answer: B (6.5 units)

Explanation

PQ = √(122 + 52) = √169 = 13, which is the diameter. The radius is 6.5 units.