6/15/2023 0 Comments Protractor math![]() If the angle to be measured is on the left-hand side of the protractor’s center, then we need to use the outer reading. ![]() Determine if you will use the inner or outer reading.Place the protractor’s baseline on the ray, which is the angle’s base. ![]() Place the center of the protractor to the vertex of any angle.Now, here’s how we can read angles using a protractor. The inner and outer reading of each angle is always a supplement of each other since the sum of it will always be 180°. Reading angles in protractorĪ protractor can be used to read angles by using its either inner or outer readings. Now, this section will help you understand how to properly use a protractor. Protractors can be used to read and measure different angles. In this lesson you will estimate angle measurements, find actual measurements using a protractor, and draw angles of various sizes. By comparing your actual answer to your estimated measurement, you can determine whether or not your answer is reasonable. Since a full circle measures 360º, an individual angle has to measure less than 360º, because it is part of a circle.Įstimating the approximate measurement of a circle before you actually measure it can be helpful. Recall what you have learned about angles already. Then in the 20 th century, protractors had also become ubiquitous in school mathematics. By the nineteenth century, machinists had developed a wide range of specialized protractors. It was then called as a three-arm protractor. Meanwhile, in 1810, Joseph Huddart, a US naval commander, produced a more advanced version of a protractor created to plot a ship’s position on a nautical chart. In the early 17 th century, protractors were widely used by navigators and surveyors. However, it was written in his book that he used the protractor to create maps, particularly for nautical charts. It is unclear whether Blundeville developed the protractor. Although older instruments were used for angle measurement in addition to other mathematical pursuits, Thomas Blundeville introduced a tool specifically for measuring and constructing angles in his 1589 Briefe Description of Universal Mappes & Cardes. The use of protractors dates back over 500 years. However, some protractors are in radian or arcminute scale. More so, most protractors have 180 equal segments. They are typically made of brass, steel, wood, ivory, or plastic.Īngles are typically measured in degrees (°). Protractors can have diameters ranging from two inches to more than twelve inches. The most common protractor is a semicircle-shaped scale ranging from 0° to 180°. What is a protractor?Ī protractor is a measuring tool often made of translucent plastic or glass used to read, measure, and construct angles. With a little practice, you will soon be measuring angles with ease. Understanding that angles are parts of circles is helpful, because then the design of the protractor makes sense. There are many things to which you must pay attention. Measuring angles with a protractor can be a confusing experience. What is the importance of using a protractor?.What are the different kinds of protractors?.How to construct angles using a protractor?.
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