please be patient] $\,\angle 1\,$ and $\,\angle 2\,$ are vertical angles, then $\,m\angle 1 = m\angle 2\ $. DEFINITION parallel lines. Two lines are parallel if and only if they lie in the same plane and do not intersect. Parallel lines are studied in more detail in a future section, Parallel Lines. The symbol â$\,\parallel\,$â is used to denote parallel lines.
Types of Rate Control Drugs. There are three types of rate control medications: 1  Beta Blockers, which slow the heart rate and relax the blood vessels. 2  Examples include Atenolol (Tenormin Â®), Carvedilol (Coregâ¢), Metoprolol (Toprol XLâ¢, Lopressor Â®), and Sotalol (Betapace Â®).
The symptoms of atrial fibrillation are caused by the irregular heartbeat. Some people find Afib episodes to be painful and frightening. Others say they are simply uncomfortable. To help, your medical team may prescribe medications aimed at controlling your heart rate and your heart rhythm. In some cases, the same medications are used to control both. Beta blockers are a class of medications that are commonly used for heart rate control. These medications block some of the effects of adrenaline, which tends to make the heart beat faster. Metoprolol is an example of a commonly used beta blocker.