![]() Using a protractor, read the angle given in the figure. If the angle is formed on the right-hand side of the protractor’s center, use the inner reading. 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. Although the protractors are one-sided, they confuse new learners, so it is much easier for them to have protractors with both parties. Determine if you will use the inner or outer reading. Mechanics or engineers can use protractors, but the most common use is in schools and geometry classes. Materials that protractors are made of can be wood, ivory, plastic, or metal. Protractors can be made in various shapes: the most popular semi-circle, full circle, square, rectangle, sixth circle, or quarter circle. By the nineteenth century, many different versions of protractors appeared, and by the twentieth century, the protractors became the standard for school mathematics. Two arms are rotatable, and one central arm is fixed so the protractor can set any angle relative to the center arm.īy the eighteen century, protractors were widely used in geometry and mathematics. ![]() Its corresponding number is 80 on the protractor. This lesson includes math videos, study tips and practice questions with. You simply take your obtuse number, find its corresponding number on the protractor and divide it by two. This protractor was named three arm protractor because it had a circular scale and three arms. Learn how to measure angles by using a protractor. If you need to measure an angle, find the degrees of the angle, or compare two angles, the Online Protractor app is for you. Joseph Huddart designed more sophisticated versions of the protractor in 1810 for calculating ship position at sea. By the seventeenth century, protractors were standard tools for navigation at sea by sailors. ![]()
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