P, Q and R are the points on a plane
- How many points are possible in the plane that are equidistant from both P and Q?
- If R is equidistant from both P and Q, then how many points are possible in the plane that are the same distance from all three points.
- If R does lie on line PQ but not equidistant from P and Q, then how many points are possible in the plane that are the same distance from all three points.
- If R does not lie on line PQ, then how many points are possible in the plane that are the same distance from all three points.
For $1$, I find infinite points in up and down through the middle point of line PQ.
For $2$, I find noone point
For $3$, I find no point
For $4$, I find only one point
Though this all is my guess after sketching lines on paper. Can anyone explain how to solve these?