MIRROR command in AutoCAD - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the MIRROR command effect

What happens to an object in AutoCAD when you use the MIRROR command and select a mirror line?

A The object is moved parallel to the mirror line without changing shape.

B The object is rotated 90 degrees around the mirror line.

C The object is deleted and replaced with a new one.

D The object is flipped across the mirror line creating a symmetrical copy.

💡 Hint

Think about how a reflection works in a mirror.

The MIRROR command flips the selected object across the mirror line, creating a symmetrical copy on the opposite side.

🎯 Scenario

intermediate

Using MIRROR command with delete option

You want to mirror a door symbol in your floor plan but do not want to keep the original. Which option should you choose after selecting the mirror line?

A Choose to delete the original object after mirroring.

B Choose to keep the original object after mirroring.

C Choose to rotate the original object instead of mirroring.

D Choose to scale the original object after mirroring.

💡 Hint

Think about whether you want one or two objects after mirroring.

After selecting the mirror line, AutoCAD asks if you want to keep the original. Choosing to delete it removes the original and keeps only the mirrored copy.

❓ dax_lod_result

advanced

Calculating mirrored sales totals with DAX

You have a sales table with regions 'East' and 'West'. You want to create a measure that sums sales for the 'West' region and mirrors it as if it were 'East'. Which DAX expression correctly calculates the mirrored sales total?

AutoCAD

Mirrored Sales = CALCULATE(SUM(Sales[Amount]), Sales[Region] = "West")

A Mirrored Sales = CALCULATE(SUM(Sales[Amount]), Sales[Region] = "East")

B Mirrored Sales = CALCULATE(SUM(Sales[Amount]), Sales[Region] = "West")

C Mirrored Sales = CALCULATE(SUM(Sales[Amount]), Sales[Region] = "East" || Sales[Region] = "West")

D Mirrored Sales = CALCULATE(SUM(Sales[Amount]), Sales[Region] <> "East")

💡 Hint

Focus on summing sales only for the 'West' region as the mirrored value.

The measure sums sales where the region is 'West', representing the mirrored sales total for 'East'.

❓ visualization

advanced

Best visualization to show mirrored data comparison

You want to visually compare original and mirrored sales data side by side for easy symmetry analysis. Which visualization type is best suited for this?

A Side-by-side bar chart comparing original and mirrored sales.

B Stacked bar chart showing total sales by region.

C Pie chart showing percentage of total sales by region.

D Line chart showing sales trend over time.

💡 Hint

Think about comparing two related values clearly next to each other.

Side-by-side bar charts allow direct comparison of original and mirrored sales values, making symmetry easy to see.

🔧 Formula Fix

expert

Debugging MIRROR command unexpected behavior

You used the MIRROR command on a complex block but the mirrored copy appears distorted. What is the most likely cause?

A The original object was deleted accidentally before mirroring.

B The block was exploded before mirroring causing loss of data.

C The mirror line was not drawn correctly causing skewed transformation.

D The scale factor was set to zero during mirroring.

💡 Hint

Consider how the mirror line affects the shape of the mirrored object.

If the mirror line is not straight or correctly placed, the mirrored object can appear distorted due to incorrect reflection axis.

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