POLYGON command in AutoCAD - Step-by-Step Guide

Introduction

The POLYGON command in AutoCAD helps you draw regular polygons like triangles, squares, or hexagons quickly. It solves the problem of manually drawing and measuring each side by automating the shape creation with equal sides and angles.

When you need to draw a perfect hexagon for a mechanical part design.

When creating a floor plan that requires regular shapes like octagons for rooms.

When designing a logo that includes symmetrical polygons.

When you want to create a stop sign shape (octagon) accurately.

When you need to draw a triangle or square with exact side lengths.

Steps

Step 1: Type POLYGON and press Enter

- Command line

AutoCAD prompts you to enter the number of sides for the polygon

💡 You can also find POLYGON in the Draw panel on the Home tab

Step 2: Enter the number of sides (e.g., 6 for hexagon) and press Enter

- Command line prompt

AutoCAD asks for the center point of the polygon

💡 Choose a number greater than 2 for a valid polygon

Step 3: Click a point in the drawing area to set the polygon center

- Drawing area

AutoCAD prompts you to choose between inscribed or circumscribed polygon

💡 Inscribed means the polygon fits inside the circle; circumscribed means the circle fits outside the polygon

Step 4: Type I for inscribed or C for circumscribed and press Enter

- Command line prompt

AutoCAD asks for the radius length

💡 Choose based on how you want the polygon sized relative to the circle

Step 5: Click a point or type a distance to set the radius and press Enter

- Drawing area or command line

AutoCAD draws the regular polygon with the specified number of sides and size

Before vs After

Before

No polygon shape exists in the drawing

After

A regular polygon with the chosen number of sides and size appears centered at the selected point

Settings Reference

Number of sides

📍 Command line after starting POLYGON

Defines how many sides the polygon will have

Default: None

Polygon type

📍 Command line prompt after center point

Determines if polygon fits inside or outside the circle

Default: None

Radius length

📍 Command line or drawing area after polygon type

Sets the size of the polygon

Default: None

Common Mistakes

Entering a number of sides less than 3

Polygons must have at least 3 sides to be valid shapes

Always enter 3 or more for the number of sides

Confusing inscribed and circumscribed options

Choosing the wrong option changes the polygon size unexpectedly

Remember inscribed fits inside the circle, circumscribed means the circle fits outside the polygon

Not specifying the radius or clicking too close to center

Polygon may be too small or not visible

Click or type a clear radius distance to see the polygon properly

Summary

POLYGON command draws regular polygons with equal sides and angles.

You choose the number of sides, center point, polygon type, and size.

Remember to enter at least 3 sides and pick inscribed or circumscribed carefully.

Practice

1.

What does the POLYGON command in AutoCAD primarily create?

easy

A. A freehand drawing

B. A regular shape with equal sides

C. A 3D solid object

D. A text annotation

Solution

1. Step 1: Understand the purpose of POLYGON command

   The POLYGON command is designed to create shapes with equal-length sides and equal angles.

2. Step 2: Identify the shape type created

   Since it creates regular polygons, the shape has equal sides and angles.

3. Final Answer:

   A regular shape with equal sides -> Option B

4. Quick Check:

   POLYGON = Regular shape with equal sides [OK]

Hint: POLYGON always draws shapes with equal sides [OK]

Common Mistakes:

• Thinking POLYGON creates freehand drawings
• Confusing POLYGON with 3D modeling commands
• Assuming POLYGON creates text or annotations

2.

Which of the following is the correct first step when using the POLYGON command in AutoCAD?

easy

A. Choose the polygon color

B. Draw a circle first

C. Enter the center point of the polygon

D. Specify the number of sides

Solution

1. Step 1: Recall the POLYGON command sequence

   The first prompt after starting POLYGON is to specify the number of sides.

2. Step 2: Confirm the initial input required

   You must enter how many sides the polygon will have before placing it.

3. Final Answer:

   Specify the number of sides -> Option D

4. Quick Check:

   First step = Number of sides [OK]

Hint: Always start POLYGON by entering sides count [OK]

Common Mistakes:

• Trying to pick center point before sides
• Drawing a circle before POLYGON command
• Selecting color before shape creation

3.

What will happen if you enter 6 for sides, specify the center point, and choose inscribed circle option with radius 10 in the POLYGON command?

medium

A. A hexagon fits inside a circle of radius 10

B. A hexagon circumscribes a circle of radius 10

C. A circle with radius 10 is drawn inside a hexagon

D. A hexagon with sides length 10 is drawn

Solution

1. Step 1: Understand inscribed polygon meaning

   An inscribed polygon fits inside the circle, touching it at vertices.

2. Step 2: Apply to a hexagon with radius 10

   The hexagon's vertices lie on the circle of radius 10, so it fits inside that circle.

3. Final Answer:

   A hexagon fits inside a circle of radius 10 -> Option A

4. Quick Check:

   Inscribed polygon = inside circle [OK]

Hint: Inscribed means polygon inside circle touching vertices [OK]

Common Mistakes:

• Confusing inscribed with circumscribed
• Assuming side length equals radius
• Thinking circle is inside polygon

4.

You used the POLYGON command and entered 5 sides, then clicked a center point, but the polygon does not appear. What is the most likely error?

medium

A. You did not specify inscribed or circumscribed option

B. You entered an invalid number of sides

C. You did not specify the radius or edge length

D. You forgot to press Enter after center point

Solution

1. Step 1: Recall POLYGON command steps

   After center point, you must specify radius or edge length to define polygon size.

2. Step 2: Identify missing input

   If polygon does not appear, likely radius or edge length was not entered.

3. Final Answer:

   You did not specify the radius or edge length -> Option C

4. Quick Check:

   Missing radius/edge length = no polygon drawn [OK]

Hint: Always enter radius or edge length after center point [OK]

Common Mistakes:

• Skipping radius input thinking center point is enough
• Confusing inscribed/circumscribed as mandatory first step
• Assuming polygon draws automatically after center point

5.

You want to draw a regular octagon that exactly fits around a circle with radius 15. Which option should you choose after specifying the center point in the POLYGON command?

hard

A. Circumscribed about circle

B. Inscribed in circle

C. Draw polygon freehand

D. Specify side length as 15

Solution

1. Step 1: Understand circumscribed polygon meaning

   A circumscribed polygon surrounds the circle, touching it at the midpoint of each side.

2. Step 2: Match polygon to circle radius

   To fit the polygon around the circle of radius 15, choose circumscribed option so polygon edges touch the circle.

3. Final Answer:

   Circumscribed about circle -> Option A

4. Quick Check:

   Polygon around circle = Circumscribed [OK]

Hint: Choose circumscribed to fit polygon around circle [OK]

Common Mistakes:

• Choosing inscribed which fits polygon inside circle
• Trying to draw freehand polygon
• Using side length instead of circle radius