Align the blade with any given angle on paper or scrap wood, or swivel the blade to match an angle on wood. Task. Measuring angles without the need of a protractor These worksheets are ideal to practice to measure angles with a protractor. But what I want to do in this video is come up with an exact way to measure an angle. [2] X Research source The vertical line creates a right triangle. How To Measure Angles Without A Protractor. So let's try to do that. Common Core Connection for 4th Grade Recognize that angles are formed when two rays share a common endpoint. The angle formed by the … Task. How To Measure Angles Without A Protractor. You want to rotate the protractor so that the 0 angle, or kind of the 0 mark, is at one of the sides of the angle. Measure the angle in degrees. It’s the adorable angle. The FULL CIRCLE is 360° (360 degrees). If it is angled up or down, it will ruin the accuracy of your equation. Pivot Square. Understand concepts of angle measurement. 160. In this case, we're going to rotate the protractor. Explore how to use a protractor and identify acute, obtuse, straight and reflex angles.