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®).
Taking your heart failure medications as prescribed is one of the most important things you can do to manage your condition. The more you know about your medications and how they work, the easier it will be for you to stay on track. Common types of drugs used to treat heart failure include: 1  Aldosterone inhibitors. 2  Angiotensin converting enzyme (ACE) inhibitors. 3  Angiotensin II receptor blockers (ARBs). 4  Angiotensin Receptor-Neprilysin Inhibitors (ARNIs). 5  Beta-blockers. 6  Blood vessel dilators. 7  Calcium channel blockers. 8  Digoxin.