The line segment joining and is a diameter of a circle. Which of these points lies on the circle?

Answer and explanation

Correct answer: E.

  1. Step 1: The centre is the midpoint . The diameter has length , so the radius is .
  2. Step 2: A point is on the circle if its distance from is . For the distance is .
Answer
.
Why not the others: The distances from the centre are for , for , for and for , none of which is .

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