MIRROR command in AutoCAD - Real Business Scenario

Scenario Mode

👤 Your Role: You are a CAD technician working in an architectural firm.

📋 Request: Your manager wants you to create a symmetrical floor plan by mirroring the existing half of the design.

📊 Data: You have a drawing file with half of the floor plan drawn as lines, doors, and windows.

🎯 Deliverable: Produce a complete floor plan by using the MIRROR command to duplicate and flip the existing half accurately.

Sample Data

Object	Coordinates Start (X,Y)	Coordinates End (X,Y)
Wall Line 1	(0,0)	(10,0)
Wall Line 2	(10,0)	(10,15)
Wall Line 3	(10,15)	(0,15)
Door	(5,0)	(5,1)
Window	(8,10)	(9,10)

1

Step 1: Select all objects that form the half floor plan you want to mirror.

Use the selection tool to highlight Wall Line 1, Wall Line 2, Wall Line 3, Door, and Window.

Expected Result

All half floor plan objects are selected.

2

Step 2: Activate the MIRROR command.

Type MIRROR in the command line and press Enter.

Expected Result

AutoCAD prompts for the first point of the mirror line.

3

Step 3: Specify the first point of the mirror line along the vertical axis at X=10.

Click or type coordinates (10,0) and press Enter.

Expected Result

First mirror line point is set at (10,0).

4

Step 4: Specify the second point of the mirror line to define a vertical line.

Click or type coordinates (10,15) and press Enter.

Expected Result

Mirror line is defined vertically along X=10.

5

Step 5: Choose whether to delete the original objects after mirroring.

Type N for No and press Enter to keep original objects.

Expected Result

Original objects remain; mirrored objects are created on the opposite side.

6

Step 6: Verify the mirrored objects form the complete floor plan.

Visually inspect the drawing to confirm symmetry and alignment.

Expected Result

Complete symmetrical floor plan is visible with mirrored half matching original.

Final Result

Original Half Floor Plan | Mirror Line (X=10) | Mirrored Half Floor Plan
-------------------------|---------------------|-------------------------
| Wall Line 1            |                     | Wall Line 1 (mirrored)   
| Door                   |                     | Door (mirrored)          
| Window                 |                     | Window (mirrored)        
| Wall Line 2            |                     | Wall Line 2 (mirrored)   
| Wall Line 3            |                     | Wall Line 3 (mirrored)   

✓The MIRROR command creates an exact flipped copy of selected objects.

✓Using a vertical mirror line at X=10 produces a symmetrical floor plan.

✓Choosing not to delete original objects keeps both halves visible for comparison.

Bonus Challenge

Use the MIRROR command to create a symmetrical design but delete the original objects after mirroring.

Show Hint

When prompted to delete original objects, type Y for Yes and press Enter.

Practice

1. What does the MIRROR command do in AutoCAD?

easy

A. Creates a flipped copy of selected objects

B. Deletes selected objects permanently

C. Rotates objects around a point

D. Scales objects to a new size

Solution

1. Step 1: Understand the MIRROR command purpose

   The MIRROR command is used to create a flipped copy of selected objects across a mirror line.

2. Step 2: Compare options with command function

   Only Creates a flipped copy of selected objects describes creating a flipped copy, which matches the MIRROR command's function.

3. Final Answer:

   Creates a flipped copy of selected objects -> Option A

4. Quick Check:

   MIRROR = flipped copy [OK]

Hint: MIRROR flips objects like a reflection [OK]

Common Mistakes:

• Confusing MIRROR with DELETE command
• Thinking MIRROR rotates objects
• Assuming MIRROR scales objects

2. Which of the following is the correct syntax to start the MIRROR command in AutoCAD?

easy

A. MIRR

B. MIRROR

C. MIRRORR

D. MIR

Solution

1. Step 1: Recall the exact command name

   The correct command to start mirroring is MIRROR.

2. Step 2: Check each option for correctness

   Only MIRROR matches the full and correct command name; others are incorrect or invalid.

3. Final Answer:

   MIRROR -> Option B

4. Quick Check:

   Command syntax = MIRROR [OK]

Hint: Type full command MIRROR to avoid errors [OK]

Common Mistakes:

• Using incomplete command like MIR or MIRR
• Adding extra letters like MIRRORR
• Assuming abbreviations always work

3. You select a rectangle and use the MIRROR command with mirror line points at (0,0) and (0,5). You choose to keep the original objects. What will be the result?

medium

A. The rectangle is deleted and replaced by a flipped copy

B. Only the original rectangle remains, no copy created

C. A flipped copy of the rectangle across the vertical line x=0, plus the original rectangle

D. A rotated copy of the rectangle around point (0,0)

Solution

1. Step 1: Identify mirror line and effect

   The mirror line is vertical at x=0, so the rectangle will be flipped horizontally across this line.

2. Step 2: Consider the option to keep original objects

   Choosing to keep originals means both the original and flipped copy will appear.

3. Final Answer:

   A flipped copy of the rectangle across the vertical line x=0, plus the original rectangle -> Option C

4. Quick Check:

   Mirror line vertical + keep original = flipped copy + original [OK]

Hint: Mirror line flips; keep original means both appear [OK]

Common Mistakes:

• Thinking original is deleted when 'keep' is chosen
• Confusing mirror with rotation
• Ignoring mirror line orientation

4. You tried to mirror a circle but after entering the two mirror points, AutoCAD gave an error and did not create the mirrored object. What is the most likely cause?

medium

A. The two mirror points are the same point

B. The circle is locked and cannot be mirrored

C. You forgot to select the circle before starting MIRROR

D. The MIRROR command does not work on circles

Solution

1. Step 1: Analyze mirror line points

   If the two mirror points are the same, the mirror line is invalid (zero length), causing an error.

2. Step 2: Check other options

   Circles can be mirrored, and selection is required before command, but error after points means mirror line issue.

3. Final Answer:

   The two mirror points are the same point -> Option A

4. Quick Check:

   Mirror line must have two distinct points [OK]

Hint: Mirror line needs two different points [OK]

Common Mistakes:

• Assuming MIRROR can't work on circles
• Forgetting to select objects before MIRROR
• Ignoring mirror line validity

5. You want to create a symmetrical floor plan by mirroring half of the design along a horizontal axis at y=10, keeping both the original and mirrored halves. Which steps should you follow?

hard

A. Select half design -> ROTATE command -> pick center (0,10) -> rotate 180 degrees

B. Select half design -> MIRROR command -> pick mirror line points (0,10) and (5,10) -> choose 'No' to keep original

C. Select full design -> MIRROR command -> pick mirror line points (0,0) and (10,0) -> choose 'No' to keep original

D. Select half design -> MIRROR command -> pick mirror line points (0,10) and (5,10) -> choose 'Yes' to keep original

Solution

1. Step 1: Select the correct half and mirror line

   Select the half design to mirror and use a horizontal mirror line at y=10 by picking points (0,10) and (5,10).

2. Step 2: Choose to keep original after mirroring

   Choosing 'Yes' to "Erase source objects?" means the original objects are kept, so both the original and mirrored halves appear to form the symmetrical floor plan.

3. Final Answer:

   Select half design -> MIRROR command -> pick mirror line points (0,10) and (5,10) -> choose 'Yes' to keep original -> Option D

4. Quick Check:

   Mirror half + horizontal line + keep original = symmetrical plan [OK]

Hint: Pick mirror line, choose 'Yes' to keep original [OK]

Common Mistakes:

• Choosing 'No' deletes original, leaving only mirrored side
• Using ROTATE instead of MIRROR
• Selecting full design instead of half