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OAU Post-UTME Mathematics 2013 Question 3

Question 3

Coordinate Geometry

Find the diameter of the circle 2x2 + 2y2 − 50 = 0

  1. A.−10units
  2. B.10units
  3. C.25 units
  4. D.−25 units
Show the answer and explanation

Answer: B (10units)

Explanation

Divide by 2: x² + y² = 25, so r = 5 and the diameter is 10 units.