One in every 5 children in the U.S. develops anemia at some point during childhood, according to the authors of a June 2010 article published in American Family Physician. While there are many causes of childhood anemia, some common signs and symptoms are prevalent in children affected by the condition. If your child has signs or symptoms suggestive of anemia, schedule an appointment with your doctor for testing and appropriate treatment.
Semi in Latin means half. Semicircle by itself means half circle. In Geometry, semicircle can be defined as a 2-dimensional figure that forms half of a circle is called Semicircle. It is a closed shape that is half a circle but diameter of that circle. Which means the diameter of a circle cuts the circle into two equal semicircles.
A polygon is a shape that is closed and is made up of only lines (no curves). It can have no open parts. Polygon in this case is a broader term to encompass a great many shapes including the square, rectangle and triangle. The circle described above cannot be considered a polygon because it is created by using curves, something which is not allowed by the simple definition of a polygon.