There are 360 degrees in a circle and angles 1, 2, and 3 together complete the circle. The sum of angles 1, 2, and 3 equals 360 degrees. Angle 3 is a straight line, so it follows that the sum of angles 1 and 2, 180°, is also a straight line. The sum of angles 1 and 2 is 180 degrees. What is the sum of angles 1 and 2? How does that number compare to angle 3? You should find that the angles measure as follows: Measure angles 1, 2, and 3 using a protractor to follow the steps above. First, make sure that you correctly identify the angle in question. Measuring Angles Measuring Angles Use the on-screen protractor to measure the size of the given angles as accurately as you can. Read the degrees off the protractor where the line of the other side is or mark a point along the edge at the appropriate angle measurement.Įxample 1 - Part A. Example: Use a protractor to find the measure of MLN in the diagram below. Make sure one side of the angle is on the zero line. Place the hole of the protractor over the point of the angle where the lines meet. There is a small hole in the center of the protractor. As shown below, a protractor is a half or full circle measuring device, marked in degrees along the outer edge, with a straight line running from 0° to 180°. This Plastic Protractor/Angle Finder allows quick measurement and transfer of both inside and outside sloped angles. A protractor is used for measuring angles. There are 360° in a full circle, and 90° in a right angle. The readings can be taken either to the right or to the left, according to the direction in which the zero on the main scale is moved.Degrees are the unit of measure used for angles, just as feet are used to measure distance. Since the spaces, both on the main scale and the Vernier scale, are numbered both to the right and to the left from zero, any angle can be measured. To measure an angle of over 90°, subtract the number of degrees as indicated on the dial from 180°, as the dial is graduated from opposite zero marks to 90° each way. To measure an angle between the beam and the blade of 90° or less, the reading may be obtained direct from the graduation number on the dial indicated by the mark on the swivel plate. When the edges of the beam and blade are parallel, a small mark on the swivel plate coincides with the zero line on the graduated dial. The bevel protractor consists of a beam, a graduated dial and a blade which is connected to a swivel plate (with Vernier scale) by thumb nut and clamp. It reads to 5 arcminutes (5′ or 1 / 12°) and can measure angles from 0° to 360°. The bevel protractor is used to establish and test angles to very close tolerances. Universal bevel protractors are also used by toolmakers as they measure angles by mechanical contact they are classed as mechanical protractors. It has wide application in architectural and mechanical drawing, although its use is decreasing with the availability of modern drawing software or CAD. Sometimes Vernier scales are attached to give more precise readings. The most common units of measures for angles are the degree (°) and the radian (rad). To facilitate its usage, the protractor often possesses two graduations going in both directions. Another form of protractors available would be the full disc graduated from 0 to 360°. A bevel protractor is a graduated circular protractor with one pivoted arm used for measuring or marking off angles. The protractor is graduated from 0 to 180 degrees (°). Heavy duty, foldable stainless steel with hanging holes Metric & imperial graduations on both arms Measures angles & length Integrated angle finder.
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