Keep that in mind if you have a struggling student. If you have unidentified learning disabled students in your class, this is one of those times when their skill deficiencies will compound. It also teaches students vocabulary related to angles and its properties. Times like this is when I introduce the ‘power of yet.’ If a student exclaims “I can’t do this!” or “I don’t understand this!” I remind them to take a deep breath and say “yet.”Ī protractor is not just a tool to calculate angles. Especially if this is a new tool and concept for them. Initially, your students may struggle with using a protractor. You will be able to find the angle’s value. Then, line up the other side of the angle with the 90-degree scale on the inner side of the protractor. You should align the 90-degree scale on one side of the protractor with the 0 degree line on a map, which is located on the right side. Once you have reached the desired angle, the number of one-degree curves on the curved edge of the protractor’s outer scale will equal the degree of the angle.Ī protractor has two scales, one for degrees and one for millimeters. To use a protractor, line the angle with one end of the protractor’s curved edge, then place the ruler on the other side of the curved edge, and count the number of degrees along each curve until the other ray is located. In most cases, they have a circle or cross in the middle. How is a protractor used?Ī protractor is a tool for measuring angles. And for some students, the visualization and hands-on activities adds in some multi-sensory learning that helps them learn better. The need for using protractors is becoming less popular as a result of computer software and the internet. Both types of protractors have a graduated circle and a pivoting arm. There are two basic types: the circular and the semicircular. You can also read a protractor by using its baseline, which is the side that has zero.Ī protractor is a simple tool used for calculating angles. The device has a number scale that goes from zero to 180 degrees, with one side of the angle lining up with 0 on its inner scale and a cosine scale on its outer scale.īy lining up these scales, you can measure angles accurately and get the right answer. What is a protractor?Ī protractor is a tool used in mathematics to calculate angles. Here are some of the most common uses of a protractor. I hope this will help with with dome makers for generations to come.ĪGAIN I WANT TO STATE THAT I HAVE NOT CHECKED THE ACCURACY OF THE ANGLES SO USE THEM AT YOUR OWN RISK.Before you start measuring things, you might be wondering: what is a protractor? What is its purpose? How do schools teach students to use a protractor?Īnd what can you measure with a protractor? This article will explain the basics. I have havent checked how accurate it is yet as i was looking for one to buy at the time. The best one i found was this one found on a teachiners website (the idea is to print one for every student in the class to use thru-out the lesson and easily disposable after) I recently come across a few sites that give you one to print and use. I have seen a few threads asking where to buy a protractor.
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