You may also like

problem icon

Baby Circle


problem icon

Orthogonal Circle

Given any three non intersecting circles in the plane find another circle or straight line which cuts all three circles orthogonally.

problem icon



Square Pair Circles


For example

25 = 02 + (±5)2 = (±5)2 + 02 = (±3)2 + (±4)2 = (±4)2 + (±3)2

and this shows that there are 12 points with integer coordinates on the circle x2+ y2 = 52 with centre at the origin and radius 5 units.