Changes

The '''center''' of a [[geometric]] shape is a point that, on average, the points of the shape are [[equidistant]] from. This point does not have to be on the shape itself.  

The '''center''' of a [[geometric]] shape is a point that, on average, the points of the shape are [[equidistant]] from. This point does not have to be on the shape itself.  

For example, all the points of a [[circle]] are equidistant the center, however the center is not a point on the circle because the circle is only the rim and has empty interior. In contrast, the center of a disk is a point of the disk.  

For example, all the points of a [[circle]] are equidistant from the center, however the center is not a point on the circle because the circle is only the rim and has empty interior. In contrast, the center of a disk is a point of the disk.  

The center of a [[square]] is not the same distance from every point on the square--the corners are further away from the center than the [[midpoint]]s of the sides. The center of a square is the point where the two [[diagonal]]s intersect.

The center of a [[square]] is not the same distance from every point on the square--the corners are further away from the center than the [[midpoint]]s of the sides. The center of a square is the point where the two [[diagonal]]s intersect.