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Protractor, in math, is considered to be an important measuring instrument that is in the shape of a semi-circle.The common protractor is a translucent tool that helps us measure angles in degrees. A radian scale protractor measures an angle in radians. If we observe the figure given below, we can see that a common protractor has degrees marked clockwise from 0° to 180° in the outer scale.
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Move up your protractor's scale from 0° and find the measurement you want for your angle. If you're drawing an acute angle, make sure you're looking at the scale numbers that are less than 90°. If you're drawing an obtuse angle, use the scale numbers that are greater than 90°. Then, simply draw a dot at the measurement.
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Keep your students engaged with hundreds of interactive skills on Oryx Learning. This online protractor tool is built to practice measuring and estimating angles. Learn how to draw and measure angles with the help of this free interactive tool.
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protractor, any of a group of instruments used to construct and measure plane angles. The simplest protractor comprises a semicircular disk graduated in degrees—from 0° to 180°. It is an ancient device that was already in use during the 13th century. At that time, European instrument makers constructed an astronomical observing device.
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Learn how to use a protractor, a tool that helps you measure angles in degrees, with this web page. See an animation, a quiz and a worksheet to practice your skills.
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Goniometer made by Develey le Jeune in Lausanne, late 18th-early 19th century. A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία 'angle' and μέτρον 'measure'. The protractor is a commonly used type in the fields of mechanics, engineering, and geometry.
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Example 1: Measuring an Angle Suppose you have an angle with one line at the 0° mark and the other line at the 60° mark on the protractor's scale. The angle measurement is 60°. Example 2: Drawing an Angle Suppose you want to draw a 30° angle. Place the protractor's center point at the end of the line, and the 0° line on the baseline.
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Practice Measuring Angles with an Interactive Protractor! Use this interactive protractor app to practice measuring angles on the screen, or download the questions as a pdf worksheet. Rotate the protractor by holding down the shift-key + left-mouse button, or use two fingers on your touch device. More instructions below.
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A protractor is a handy tool used to measure and draw angles. There are different types, but the most popular ones are the semicircular and circular ones (see image below). They often have two sets of numbers going into opposite directions: 0° to 180° and 180° to 0°. So, pupils need to be careful which scale they use when measuring the angles.
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On this tutorial, you will learn how to use a compass protractor to measure angles.Free Lesson Guide & Practice Worksheet: https://www.mashupmath.com/blog/ho.
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2. Place your protractor on the straight line to measure the acute angle. Line up the horizontal line on the baseline of your protractor, placing the center of your protractor over the vertex. Look where the diagonal line crosses the protractor to determine the number of degrees in the acute angle.
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How to use a protractor to measure and draw angles.
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A protractor is a semicircular geometry tool divided into 180 equal parts, each measuring 1°. It is used for drawing angles of known measures and finding angles of unknown measures and is usually made of transparent plastic, glass, steel, or wood. The geometry protractor have two scales marked on it: outer and inner.
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Online Protractor. This is a transparent online protractor, you can easily measure the angle of any object around you, and it helps you measure angles in a picture, taking a picture and uploading it, then dragging the midpoint of the protractor to the vertex of the angle, our virtual protractor is very accurate, it can zoom in, zoom out, rotate.