Ventricular septal defects are the second most common defect. Ventricular septal defect occurs in about 25% of all infants born with a heart defect. These defects are more common in premature infants. Treatment for ventricular septal defect include reduce symptoms with medications, antibiotics, or surgery.
Heptagon. A heptagon is a seven-sided polygon. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua- , meaning seven) with the Greek suffix-gon (from gonia, meaning angle), and is therefore not recommended. The regular heptagon, illustrated above, has Schlaefli schlÃ¤fli. symbol
Although the regular heptagon is not a constructible polygon using the classical rules of Greek geometric construction, it is constructible using a Neusis construction (Johnson 1975; left figure above). To implement the construction, place a mark on a ruler, and then build a square of side length.