A condition for the given point to be included in the domain?

Question

If we have two domains, it is possible to check whether one domain is inside another domain:

domain1 = Rectangle[{-2.5, -2.5}, {2.5, 2.5}];
domain2[R_] := Disk[{0, 0}, R]
condition[R_] := Boole @ RegionWithin[domain1, domain2[R]]

Now, let us consider a point

point[x_,y_] = {x,y}

Is it possible to check whether the point belongs to the region using something like RegionWithin (like PointWithin (?))?

Answer 1

Try

RegionMember[domain1, {1, 1}]
(*True*)

Answer 2

For a point, we can also use RegionWithin since we can consider the region Disk[{x0,y0},0]

domain1 = Rectangle[{-2.5, -2.5}, {2.5, 2.5}];
RegionWithin[domain1, Disk[{1, 1}, 0]]

True