It would be advisable to complete Student Activities 1, 2, and 3 on Circles with Centre (0,0) and the Student Activity on Circles with Centre (h,k) before attempting this interactive file. Tick a question to see it. Only have one box ticked at a time. The coordinates of the points you need are all points on the grid i.e. they all have whole number coordinates. Click the reset construction button at the top right of the page if you want another 5 questions.
(c) Project Maths Development Team