A sprinkler waters all points within 2.5 m of it. It is placed at the centre of a 4 m × 4 m square lawn. Which part of the lawn stays dry?

  1. the middle of each side
  2. none of it
  3. the four corners
  4. the centre
Answer

C) the four corners

The middle of each side is 2 m from the centre (watered), but each corner is 2^2 + 2^2 = 2 2 approx 2.83 m away, which is more than 2.5 m. SLO M-09-B-19 · Application

Mathematics MCQ · More Loci MCQs · Practise