#PROTRACTOR ANGLE HOW TO#

Side opens up or you could say points to 70 degrees. So you want the 0ĭegrees on the side, so the other side is But this isn't too helpful,īecause the angle is now outside. Vertex of my angle at the center of my protractor. And this looks like roughlyĪn 80 degree angle, not quite. So once again, put theĬenter of the protractor at the vertex of our angle. The base of the protractor, at this side of the angle. So once again, place theĬenter of the protractor at the center, at the Ray, it points to, looks like, pretty close And the other side of theĪngle is within the protractor. Is either rotate the angle or rotate the protractor. Vertex of the angle at the center of the protractor. Protractor at the center of- or I should say, at the Want to measure an angle, what you want to do Omar Rizwan, who was actuallyĪ high school intern, made this pretty neat module. And I want to giveĬredit to the person who built this protractor, because And it's a pretty coolĪctually measure angles. Make good use of this guide and score good grades in geometry.Of me is the Khan Academy measuring angles exercise.

This is how you can use a protractor to measure as well as draw angles, quickly and easily. For example, if you counted 20° from the dotted line, the reflex angle measures 180 + 20 which is 200°. Place the protractor on the vertex of the base line, and draw a dotted line for 180°.įlip the paper, keep the protractor on the vertex, and measure from the dotted line to the angle line.

#PROTRACTOR ANGLE HOW TO#

How to Measure Angles Exceeding 180° Using a Semicircular Protractor Then, flip the paper, and you have your desired angle exceeding 180° without using a circular protractor. So, 260° will be an additional 80° from 0.Īfter you’ve marked the said angle, draw a line connecting the vertex and the marked point. Place a protractor with its point on the. Draw a line segment, which is one of the arms that is to be constructed. Let us see some steps on the construction of angles using a protractor from here. For instance, if you wish to draw an angle measuring 260°, begin counting from 180 to 260. How to Draw an Angle Using a Protractor In order to construct or measure the angles may be acute, obtuse, or right angle we need a protractor. Considering the dotted line as your base line, and 0° as 180°, mark the desired angle. Now flip the paper, and hold the protractor once again on the marked vertex. Once measured, draw a dotted line from the vertex to the marked point. Then, mark a vertex, and measure 180° using your protractor. Here they are.īegin by drawing a line such that you leave ample space at the top and bottom of the line. How to Draw Angles Exceeding 180° Using a Semicircular ProtractorĪlthough drawing angles more than 180° using a regular semicircular protractor may seem like a tough job, it isn’t so. Once you measure the angle, write the reading between the two lines (as shown in the illustration). All you need is a pencil, a sheet of paper (ruled/unruled), and a ruler (optional). Take a look! How to Use a Protractor to Draw an Angleĭrawing an angle using a protractor is very simple. Additionally, we’ll also teach you to draw or measure angles more than 180° using a regular semicircular protractor. Let’s begin with learning to draw an angle using a protractor, and also learn how to measure already drawn angles. However, a semicircular protractor is also capable of measuring angles up to 360°, even though it does not have the respective markings. If semicircular protractors measure angles up to 180°, how much can a circular protractor measure? Simple! 360°. These are mostly semicircular, and can be used to draw or measure angles up to a maximum of 180°.

Protractors are widely used in schools to help students learn geometry. The latter are popularly referred to as radian-scale protractors and are used for complex, mechanical figures especially in the field of engineering or architecture. Most protractors measure angles in degrees, whereas a few also measure them in radians. Here are some step-by-step instructions, provided by ScienceStruck, on how to use a protractor. Most protractors are either circular or semicircular, and are typically made of transparent plastic for better precision. A protractor is an instrument used to measure or draw angles.

Protractor angle