Medical Definition of Snellen chart. : the chart used in the snellen test with black letters of various sizes against a white background.
The circumcenter, the incenter is the point of concurrency of the angle bisectors of a triangle.
Math Open Reference. This page shows how to construct (draw) the incenter of a triangle with compass and straightedge or ruler. The Incenter of a triangle is the point where all three angle bisectors always intersect, and is the center of the triangle's incircle. See Constructing the incircle of a triangle. In this construction, we only use two bisectors, as this is sufficient to define the point where they intersect, and we bisect the angles using the method described in Bisecting an Angle. The point where the bisectors cross is the incenter. The above animation is available as a printable step-by-step instruction sheet, which can be used for making handouts or when a computer is not available. The image below is the final drawing from the above animation. List of printable constructions worksheets.