Both compasses and protractors come in different materials, from plastic to steel. The latter can be more durable, but the former may be all you need for your geometry class.

Let us learn how to construct an angle with a compass and a ruler. In the steps shown below we will be constructing an angle of 90° and then construct an angle bisector to bisect the 90° such that we will get an angle of 45°. Are you trying to decide between using a protractor or a compass for your next project? It can be confusing to know which tool is the right one for the job. In this article, we’ll explore the differences between a protractor and a compass, and help you determine which tool is best for your needs. U.S. Army, Map Reading and Land Navigation, FM 21–26, Headquarters, Dept. of the Army, Washington, D.C. (7 May 1993), ch. 11, pp. 1–3: Any 'floating card' type compass with a straightedge or centerline axis can be used to read a map bearing by orienting the map to magnetic north using a drawn magnetic azimuth, but the process is far simpler with a protractor compass.Admiralty, Great Britain (1915) Admiralty manual of navigation, 1914, Chapter XXV: "The Magnetic Compass (continued): the analysis and correction of the deviation", London: HMSO, 525 p. Johnson, G. Mark (2003). The Ultimate Desert Handbook. McGraw-Hill Professional. ISBN 978-0-07-139303-4.

Keeping the same measurement, the pointed end is placed at point S and intersects the first arc at point R. Step 3: Without any change in radius, draw another arc with Q as the center and label this point as D. Use a protractor to measure the angle on the right-hand endpoint of the given side, mark it with a cross and draw a line from the endpoint through this mark. Reflex Angles: Reflex angles measure more than 180 degrees but less than 360 degrees.They are often used in navigation and surveying, as well as in sports and recreation.For example, a football field is marked with reflex angles to indicate the end zones.Aczel, Amir D.– Israeli-born American lecturer in mathematics and the history of mathematics and science (2001) The Riddle of the Compass: The Invention that Changed the World, 1st Ed., New York: Harcourt, ISBN 0-15-600753-3 The Bellini–Tosi direction finder was a type of radio direction finder that was widely used from World War I to World War II. It used the signals from two crossed antennas, or four individual antennas simulating two crossed ones, to re-create the radio signal in a small area between two loops of wire. The operator could then measure the angle to the target radio source by performing direction finding within this small area. The advantage to the Bellini–Tosi system is that the antennas do not move, allowing them to be built at any required size. When it comes to drawing and design, the choice between a protractor and compass depends on the task at hand. A compass is useful for creating perfect circles and arcs, while a protractor is better suited for measuring angles and creating precise geometric shapes. Mathematics And Science place it so that one side of the angle lines up with one of the zeros, and read that set of numbers.