The condition is thought to be caused by a combination of side effects of the drug (clenching and grinding of teeth, dry mouth) and lifestyle factors (infrequent oral hygiene, frequent consumption of sugary drinks), which may be present in long term users.
An Interior Angle is an angle inside a shape. Note: When we add up the Interior Angle and Exterior Angle we get a straight line, 180Â°. (See Supplementary Angles).
Interior angles of a parallelogram. Try this Drag the orange dots on each vertex to reshape the parallelogram. Notice the behavior of the four interior angles. In any polygon, the interior angles have certain properties. See Interior angles of a polygon. A parallelogram however has some additional properties. If you start at any angle, and go around the parallelogram in either direction, each pair of angles you encounter always are supplementary - they add to 180Â°.