![]() ![]() ![]() 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. ![]() 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. It can be used at a variety of different grade levels. 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. The online protractor tool can be used to practice measuring angles. It is an ancient device that was already in use during the 13th century. The simplest protractor comprises a semicircular disk graduated in degreesfrom 0° to 180°. It reads to 5 arcminutes (5′ or 1 / 12°) and can measure angles from 0° to 360°. protractor, any of a group of instruments used to construct and measure plane angles. 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. When using a protractor, notice that the outside set of numbers goes from 0 to 180 degrees where the 0 is on the left side of the protractor while the inner set goes from 180 to 0 degrees where 0 is on the right side of the protractor. Most protractors measure angles in degrees (). Sometimes Vernier scales are attached to give more precise readings. A protractor is a tool used to measure angles. To be able to establish the measure of an angle by using its complementary (example of the javelin and of the inclined road).A bevel protractor is a graduated circular protractor with one pivoted arm used for measuring or marking off angles.To teach how to place a protractor in order to properly measure an angle.Read the graduation that follows the second side of the angleĬlick and drag the protractor and its blue handles to make some measurements.Align the 0° graduation of the protractor with one of the side of the angle.Position the origin of the protractor on the tip of the angle to measure. ![]() 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°. The protractor is graduated from 0 to 180 degrees (°). The most popular version is the half disc split into 180 equal parts that each correspond to one degree. The tool used to measure angles is the protractor. The intersection of the lines is the tip of the angle. This animation illustrates how to use a protractor to measure an angle.Ĭlick and drag the protractor and its blue handles to make some measurements.Ī plan angle defines the space on the plan delimited by two crossing lines. ![]()
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