New Feature: Playlist Center! Pick a topic and let our playlists guide the way—like a learning mixtape.

Start learning with our library of video tutorials taught by experts. Get started

AutoCAD 2013 Essentials: 02 Drawing Fundamentals
Illustration by Richard Downs

Drawing polygons


From:

AutoCAD 2013 Essentials: 02 Drawing Fundamentals

with Jeff Bartels

Video: Drawing polygons

Another convenience tool AutoCAD gives us is the Polygon command. Polygon allow us to create equilateral shapes having as many sides as we desire. In this lesson, we'll explore the workflow behind the Polygon command. On my screen, I've created some polygon examples. It's important to note that every polygon that we create is based on an imaginary circle. If I pan this up, you can see how a circle could be associated with each of these shapes. In fact, the way we draw polygons is very similar to creating a circle. First, we tell AutoCAD how many sides the polygon has, then we specify the center point, followed by the radius. Now, there is one other thing that AutoCAD needs. It will need to know if the polygon is inscribed or circumscribed. In other words, does the polygon fall on the inside or the outside of the imaginary circle? The way to know which method to use depends on how your polygon was dimensioned. If it was dimensioned from point to point, it's an inscribed polygon, because it falls on the inside of the circle, and this dimension represents the circle's diameter. If the polygon is dimensioned from face to face, it's circumscribed because the polygon falls on the outside of the imaginary circle, and this dimension also represents this circle's diameter. Knowing this, I'd like to create some polygons. I'm going to pan the drawing up, and let's see if we can re-create the general geometry of the stop sign. To launch the Polygon command, we can find it up here in the Draw panel. It actually shares the same menu as the rectangle command. Now, for the number of sides, I'm going to choose 8. I'll be creating the large octagon first. I'll press Enter. I will then click onscreen to specify the center of the polygon. Now, is this polygon inscribed or circumscribed? Well, since it's dimensioned from face to face, this is circumscribed. It falls on the outside of the imaginary circle. I'll choose circumscribed. And then what is the radius of the circle? Well, I can see the diameter is 30, so the radius must be 15. Next, I'd like to create the smaller octagon. To do that, I will relaunch the Polygon command. It becomes the default up here in the Draw panel. I will accept 8 for the number of sides. Now, I need to specify the center. Here's an interesting fact: even though this polygon was created from an imaginary circle, the polygon itself has no center point. So, I'm going to press Escape and cancel this command momentarily. A really quick way to find the center of this polygon would be to launch the Line command and then use my running object snap to snap to the opposite corners.

Watch this entire course now—plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
please wait ...
AutoCAD 2013 Essentials: 02 Drawing Fundamentals
1h 56m Beginner May 21, 2012

Viewers: in countries Watching now:

AutoCAD Essentials is a multi-part series that takes a more modular approach to this massive program, used for everything from 2D and 3D CAD design, drafting, and modeling to architectural drawing and engineering projects. In this installment, author Jeff Bartels concentrates on the particulars of creating basic geometry in AutoCAD, including assigning imperial or metric units of measurement, using object snaps to control accuracy, and drawing and transforming basic lines and shapes. The last chapter in the course tests your newfound skills in a short project.

Topics include:
  • Constructing lines
  • Defining a unit of measure
  • Locking to geometry with object snaps
  • Drawing rectangles, circles, and polygons
  • Applying hatch patterns
  • Moving, copying, and rotating objects
  • Erasing elements
  • Undoing and redoing actions
Subjects:
Modeling CAD 2D Drawing 3D Drawing
Software:
AutoCAD
Author:
Jeff Bartels

Drawing polygons

Another convenience tool AutoCAD gives us is the Polygon command. Polygon allow us to create equilateral shapes having as many sides as we desire. In this lesson, we'll explore the workflow behind the Polygon command. On my screen, I've created some polygon examples. It's important to note that every polygon that we create is based on an imaginary circle. If I pan this up, you can see how a circle could be associated with each of these shapes. In fact, the way we draw polygons is very similar to creating a circle. First, we tell AutoCAD how many sides the polygon has, then we specify the center point, followed by the radius. Now, there is one other thing that AutoCAD needs. It will need to know if the polygon is inscribed or circumscribed. In other words, does the polygon fall on the inside or the outside of the imaginary circle? The way to know which method to use depends on how your polygon was dimensioned. If it was dimensioned from point to point, it's an inscribed polygon, because it falls on the inside of the circle, and this dimension represents the circle's diameter. If the polygon is dimensioned from face to face, it's circumscribed because the polygon falls on the outside of the imaginary circle, and this dimension also represents this circle's diameter. Knowing this, I'd like to create some polygons. I'm going to pan the drawing up, and let's see if we can re-create the general geometry of the stop sign. To launch the Polygon command, we can find it up here in the Draw panel. It actually shares the same menu as the rectangle command. Now, for the number of sides, I'm going to choose 8. I'll be creating the large octagon first. I'll press Enter. I will then click onscreen to specify the center of the polygon. Now, is this polygon inscribed or circumscribed? Well, since it's dimensioned from face to face, this is circumscribed. It falls on the outside of the imaginary circle. I'll choose circumscribed. And then what is the radius of the circle? Well, I can see the diameter is 30, so the radius must be 15. Next, I'd like to create the smaller octagon. To do that, I will relaunch the Polygon command. It becomes the default up here in the Draw panel. I will accept 8 for the number of sides. Now, I need to specify the center. Here's an interesting fact: even though this polygon was created from an imaginary circle, the polygon itself has no center point. So, I'm going to press Escape and cancel this command momentarily. A really quick way to find the center of this polygon would be to launch the Line command and then use my running object snap to snap to the opposite corners.

I'll press Escape when I'm finished. My new polygon will be created from the midpoint of this line. I'll launch polygon again. I'll accept 8. I will then use my running object snap to snap to the middle of this line. This polygon is also going to be circumscribed. And what is the radius of the circle? Well, the larger one had a radius of 15 and I can see the smaller one has a radius that's 1 unit less than that, so I'll type 14 and hit Enter. Now that I'm finished with this line segment, I'll select it and press Delete.

Finally, let's create the carriage bolt geometry that holds the sign to the pole. To view these dimensions, I'm going to click to the lower left and then I'll pull up and click again to create a window selection. Once I've selected that geometry, I'll click the top hot spot on the view cube. This will focus my attention on that area. I will then press Escape to deselect the objects. It looks like the carriage bolt is a hexagon. It also looks like it's dimensioned from point to point so this one is inscribed. We can also see that the center of this polygon falls 3 units below the middle of the top of the sign. Now that I know the dimensions, I'd like to restore my previous view. I could do that by rolling my mouse wheel backwards. Another way would be to come over to this navigation bar. Notice there is a Zoom tool here. If I click the flyout right beneath the tool, I can select Zoom Previous to go back to my previous view. To create the first carriage bolt, I'll launch the polygon command. It has 6 sides. To find the center of the polygon, I'm going to use temporary tracking. I'll type TK and hit Enter. My first tracking point will be the middle of the top of the sign. I will then pull straight down 3 units and hit Enter. Now that I'm where I want to be, I'll hit Enter again to resume the Polygon command. This polygon is inscribed.

And what is the radius of the circle? Well, the diameter is obviously 1 so the radius must be .5. To create the final carriage bolt, I will press the spacebar to relaunch the polygon command. I will hit Enter to accept the number of sides. I'm going to use TK to find the center point. I will snap to the middle of the bottom of the sign and pull straight up 3 units. I will then hit Enter to return the Polygon command. This polygon is also inscribed and has a radius of .5. As you can see, once you understand the difference between an inscribed and a circumscribed polygon, creating these shapes is as easy as drawing a circle.

There are currently no FAQs about AutoCAD 2013 Essentials: 02 Drawing Fundamentals.

 
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.
Upgrade now


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

join now Upgrade now

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed AutoCAD 2013 Essentials: 02 Drawing Fundamentals.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Notes cannot be added for locked videos.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.