a line, line segment, or ray that touches a circle at one point (cannot go within the circle).
A line in the plane of a circle that touches a circle in exactly one point. tessellation- A mosaic formed by repetitions of a single shape.
A line that is coplanar with the circle and intersects the circle in exactly one point.
A line in the plane of the circle that intersects the circle in exactly one point, called the point of tangency.