triangles are everywhere

triangles are everywhere. They are among the most important objects studied in mathematics owing to the rich mathematical theory built up around them in Euclidean geometry and trigonometry, and also to their applicability in such areas as astronomy, architecture, engineering, physics, navigation, and surveying.
Like triangles, rational expressions are used by many professions in today’s real world. About 30 well known jobs require the use of rational expressions. Nurses use rational expressions for the concentration of a drug in the bloodstream to determine dosage, farmers use them to predict moisture by taking soil samples, and captain of a ship may have to use rational expressions in the case of trying to figure out how long it’s going to take them to get to a certain location. We encounter rational expressions all the time in the real world, often without even realizing it.

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