CEA test: Carcinoembryonic antigen test is to detect response to therapy in cancer patients, especially colon cancer, with normal range of less than 2.5 (less than 5 in heavy smokers). Note that a positive test may not always be indicative of cancer.
Os Trigonum Syndrome. An Os Trigonum is a small, extra bone found at the back of the ankle in approximately 5-10% of people. Often it goes completely unnoticed, not causing any problems.
A polygon is a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments. Area of Polygon = ((side)Â² * N) / (4Tan(Ï / N)) Perimeter of Polygon = N * (side).Area of Polygon = Â½ * RÂ² * Sin(2Ï / N).Area of Polygon = AÂ² * N * Tan(Ï / N). A = R * Cos(Ï / N). = side / (2 * Tan(Ï / N)) where, N = Number of sides, A = Apothem, R = Radius, P = Perimeter. Polygon Formula : Using length of a side : Using radius (circumradius) : Using apothem (inradius) : where. Using apothem and length of a side : where.