Clinical informaticians, also known as clinical informaticists, transform health care by analyzing, designing, implementing, and evaluating information and communication systems that enhance individual and population health outcomes, improve [patient] care, and strengthen the clinician-patient relationship.
An ellipse is defined by two points, each called a focus. (F1, F2 above). If you take any point on the ellipse, the sum of the distances to the focus points is constant. In the figure above, drag the point on the ellipse around and see that while the distances to the focus points vary, their sum is constant. The size of the ellipse is determined by the sum of these two distances.
Both ellipse and circle are closed two-dimensional figures, which are referred as conic sections. A conic section is formed when a right circular cone and a plane intersect. There are four conic sections: circle, ellipse, parabola and hyperbola. The conic section type depends on the angle between the plane and the axis of the cone.