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Creates a smooth curve that passes through or near a set of fit points, or that is defined by the vertices in a control frame.

Splines are defined either with fit points or with control vertices. By default, fit points coincide with the spline, while control vertices define a control frame. Control frames provide a convenient method to shape the spline. Each method has its advantages.
AutoCAD drawing tools: Spline Fit and Spline CV

How to activate the spline command in AutoCAD:
1. Command method
Command: spline
cmd spline

2. Toolbar method
First, you must change the workspace to Drafting & Annotation. READ HOW TO CHANGE WORKSPACE.

 Spline Fit
 Spline Control Vertices (CV)

1. Click Home Tab
2. Click Draw
3. Click Spline Fit Logo

1. Click Home Tab
2. Click Draw
3. Click Spline CV Logo







Make a Spline in AutoCAD:
1. Activated spline command
2. Create First Point, specifies the first point of the spline, either the first fit point or the first control vertex, depending on the current method.
3. Next Point, creates additional spline segments until you press Enter.

4. Undo, removes the last specified point.
5. Close, closes the spline by defining the last point to be coincident with the first. By default, closed splines are periodic, maintaining curvature continuity (C2) along the entire loop.


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Reference: Help AutoCAD 2017

AutoCAD drawing tools: Spline Fit and Spline CV

The circle is a type of command to make a round object closed in AutoCAD. The principle of making a circle is to determine the center point and radius (diameter). There are six ways to create a Circle.
AutoCAD drawing tools: Circle

How to activate the circle command in AutoCAD:
1. Command method
Command: circle
Command method

2. Toolbar method
Toolbar method

Make a Circle with the center-radius method in AutoCAD:
1. Click the Home tab
2. Click the Draw ribbon panel, then click the Circle Click Center-radius logo
3. Determine the center of the circle (point 1)
4. Type the circle radius, for example 3, then press enter
Make a Circle with the center-radius method in AutoCAD

Make a Circle with the center-radius method in AutoCAD



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AutoCAD drawing tools: Circle

Arc is a type of command in AutoCAD for making arcs (curved lines). There are 11 ways to create Arch including the 3-point method, start-center-end, start-center-angle, etc.
AutoCAD drawing tools: Arc

How to activate the arc command in AutoCAD:
1. Command method
Command: arc

2. Toolbar method
Toolbar method

Making Arc with 3-point method in AutoCAD:
1. Click the Home tab
2. Click the Draw ribbon panel, then click the Arch logo
3. Click 3-Point
4. Determine the starting point for making an arc (point 1)
5. Determine the second point (point 2)
6. Determine the third point (point 3)

Making Arc with 3-point method in AutoCAD
Making Arc with 3-point method in AutoCAD



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AutoCAD drawing tools: Arc

The rectangle is a device for creating boxes in AutoCAD. drawing a box with rectangle can be done by clicking directly or entering coordinate numbers through the keyboard.
AutoCAD drawing tools: Rectangle

How to activate the rectangle command:
1. Command method
Command: rec
How to activate the rectangle command

2. Toolbar method
Toolbar method

Make a Rectangle by entering coordinates:
1. Type "REC" in the command bar, then enter.
2. Click the starting point for the box, for example point 1.
3. Type @ 8.5 (8 for x and 5 coordinates for y coordinates), then press enter.
Make a Rectangle by entering coordinates:

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AutoCAD drawing tools: Rectangle

Polygon functions to create multiple objects with equal lengths. The number of polygon sides that can be formed is at least 3 sides (triangles), while the most sides that can be formed are 1024 sides. A polygon can be formed with two methods, namely Inscribed in circle and Circumscribed about circle.
AutoCAD drawing tools: Polygon

How to activate the polygon function in AutoCAD:
1. Commands Methode
Command: polygon
Commands Methode
2. Toolbar Methode
Toolbar Methode

The differences between Inscribed in circle and Circumscribed about circle
differences between the two methods

Creating Polygons with the Inscribed in circle Method :
1. Type "POLYGON" in the command bar, then enter.
2. Type the number of the polygon side, for example 5, then press enter.
3. Click the center point of the polygon.
4. Type I, then press enter.
5. Type the polygon radius, for example 4, then press enter.
Inscribed Method in circle
Creating Polygons with the circumscribed in cycle method:
1. Type "POLYGON" in the command bar, then enter.
2. Type the number of the polygon side, for example 5, then press enter.
3. Click the center point of the polygon.
4. Type C, then press enter.
5. Type the polygon radius, for example 4, then press enter.
circumscribed in cycle method


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AutoCAD drawing tools: Polygon

Polyline is a type of drawing commands to create lines, but the resulting object is a polyline single-entity line.

Differences polyline commend with Line command
Polyline:
1. If it is used for a segment that is segmented, the result of the line is a whole.
2. Can be made in combination with curved lines.
Line:
1. If it is used for a segment that is segmented, the resulting line is not a single unit.
2. Cannot be made in combination with curved lines.

How to activate the polyline command in AutoCAD:
1. Command method
Command: pline
Command method
2. Toolbar method
Toolbar method

The polyline commands application method:
a) Activate the Polyline command
b) Click the starting point for making a line (point 1)
c) Type @ 5.0 (5 for x, 0 for y), then press enter
d) Type @ 8 <30, then press enter
e) Type A (arch = curved), then press enter
f) Click point 3 (specify curvature)
g) Type L (line), then press enter
h) Click point 4 (last point), then press enter
The polyline commands application method

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AutoCAD drawing tools: Polyline

Multiline is a type of drawing command to create double lines in AutoCAD. The distance between two lines can be adjusted.
How to activate the multiline function in AutoCAD:
Command method
Type "MLINE" in the command bar

How to make a multiline with interregional distance conditions:
A) type "MLINE" in the command bar, then enter
commands: mline
b) type "J" to set the position of the cursor (justification)
c) type "z" to position the cursor in the middle (zero)
d) type "s" to set the distance between lines
e) type the distance the desired line ex: 0.5
f) Click the starting point of the line (point 1)
g) point the cursor in the desired direction (up, down, right, or left) + type the desired line length
ex: 9
h) press enter to end

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AutoCAD drawing tools: Multiline

The line is a type of drawing command to make a single straight line. Lines can be made by determining two endpoints. When used to create segmented lines, the lines forming the segment are not integrated (not one unit).
AutoCAD drawing tools: Line
How to activate the line function:
Commands Methode
Toolbar Methode
How to make Make a straight line in AutoCAD:
a) type "LINE" in the command bar, then enter 
b) Click the starting point for making a line (point 1) 
c) press shift + point the cursor in the desired direction (up, down, right, or left) + type the desired line length ex: 9
d) press ENTER
* TIPS: making a straight line can also take advantage of ORTHO functions
straight line
Make a line with the angular conditions:
a) type "LINE" in the command bar, then enter
b) Click the starting point for making a line (point 1)
c) Type the desired angle ex: 30 °, then enter
commands: <30
d) Type the desired line length ex: 9 
commands: 9
line with the angular conditions

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AutoCAD drawing tools: Line