Angular dimension in AutoCAD - Cell-by-Cell Formula Trace

Sample Data

Coordinates of two points (Point1 and Point2) in 2D space and a cell to calculate the angle between them in degrees.

Cell	Value
A1	Point1_X
B1	Point1_Y
A2	3
B2	4
A3	Point2_X
B3	Point2_Y
A4	7
B4	1
A5	Angle_Degrees
B5

Formula Trace

DEGREES(ATAN2(B4-B2, A4-A2))

Step 1: B4 - B2

Step 2: A4 - A2

Step 3: ATAN2(-3, 4)

Step 4: DEGREES(-0.6435)

Cell Reference Map

    A    B
1 Point1_X Point1_Y
2   3      4
3 Point2_X Point2_Y
4   7      1
5 Angle_Degrees  

Arrows:
A2 -> A4 (horizontal difference)
B2 -> B4 (vertical difference)

The formula uses the X and Y coordinates of Point1 (A2,B2) and Point2 (A4,B4) to calculate the angle.

Result

    A            B
1 Point1_X    Point1_Y
2    3           4
3 Point2_X    Point2_Y
4    7           1
5 Angle_Degrees  -36.87

The angle between the two points is shown in cell B5 in degrees.

The final angle result is -36.87 degrees, representing the angle from Point1 to Point2 relative to the horizontal axis.

Sheet Trace Quiz - 3 Questions

What is the vertical difference between Point2 and Point1?

A -3

B 3

C 4

D -4

Key Result

Use DEGREES(ATAN2(Y2 - Y1, X2 - X1)) to find the angle in degrees between two points.

Practice

1. What does an Angular Dimension in AutoCAD measure?

easy

A. The angle between two lines or points

B. The length of a line segment

C. The area of a closed shape

D. The radius of a circle

Solution

1. Step 1: Understand the purpose of angular dimension

   Angular dimension is used to measure angles, not lengths or areas.

2. Step 2: Identify what is measured between two lines

   The angle formed where two lines meet is the key measurement.

3. Final Answer:

   The angle between two lines or points -> Option A

4. Quick Check:

   Angular dimension = angle measurement [OK]

Hint: Angular dimension always shows angles, not lengths or areas [OK]

Common Mistakes:

• Confusing angle with length
• Thinking it measures area
• Mixing radius with angular dimension

2. Which of the following is the correct syntax to create an angular dimension in AutoCAD command line?

easy

A. DIMANGULAR

B. ANGDIM

C. DIMANGLE

D. ANGULARDIM

Solution

1. Step 1: Recall AutoCAD command for angular dimension

   The standard command is DIMANGULAR to create angular dimensions.

2. Step 2: Compare options with known command

   Only DIMANGULAR matches the correct AutoCAD command syntax.

3. Final Answer:

   DIMANGULAR -> Option A

4. Quick Check:

   Command for angular dimension = DIMANGULAR [OK]

Hint: Use DIMANGULAR command to create angular dimensions quickly [OK]

Common Mistakes:

• Typing ANGDIM instead of DIMANGULAR
• Using DIMANGLE which is invalid
• Using ANGULARDIM which doesn't exist

3. Given two lines forming a 45° angle, what will the angular dimension display if placed correctly?

medium

A. 90°

B. 0°

C. 45°

D. 135°

Solution

1. Step 1: Identify the angle between the two lines

   The lines form a 45° angle as given.

2. Step 2: Understand angular dimension output

   Angular dimension shows the actual angle between the selected lines.

3. Final Answer:

   45° -> Option C

4. Quick Check:

   Angular dimension output = actual angle [OK]

Hint: Angular dimension shows the exact angle between lines [OK]

Common Mistakes:

• Confusing complementary angles
• Reading wrong angle side
• Assuming default 90°

4. You tried to create an angular dimension but the dimension arc does not appear. What is the most likely cause?

medium

A. The drawing units are incorrect

B. The lines are parallel or overlapping

C. You used the wrong command name

D. The dimension style is set to hidden

Solution

1. Step 1: Analyze why dimension arc might not show

   If lines are parallel or overlapping, no measurable angle exists, so no arc appears.

2. Step 2: Check other options for plausibility

   Wrong command or units usually cause errors, not missing arcs; hidden style hides dimension but arc usually still shows.

3. Final Answer:

   The lines are parallel or overlapping -> Option B

4. Quick Check:

   No angle = no arc shown [OK]

Hint: Check if lines form an angle before dimensioning [OK]

Common Mistakes:

• Assuming command error causes missing arc
• Ignoring line geometry
• Not checking dimension style visibility

5. You have two intersecting lines forming an angle of 120°. You want to place an angular dimension arc inside the smaller angle instead of the larger one. How do you achieve this?

hard

A. Rotate the lines so the smaller angle is on the outside

B. Change the dimension style to 'Inside Arc' before dimensioning

C. Use the DIMANGULAR command with the 'Outside' option

D. Select the lines and then click inside the smaller angle area to place the arc

Solution

1. Step 1: Understand placement of angular dimension arc

   The arc placement depends on where you click after selecting the lines.

2. Step 2: Select lines and click inside smaller angle

   Clicking inside the smaller angle places the arc there, showing the smaller angle measurement.

3. Final Answer:

   Select the lines and then click inside the smaller angle area to place the arc -> Option D

4. Quick Check:

   Arc placement = click location inside angle [OK]

Hint: Click inside desired angle area to place arc correctly [OK]

Common Mistakes:

• Assuming dimension style controls arc side
• Using wrong command options
• Rotating lines unnecessarily