Drawing Tools in Autocad

 LINE
Using this command in Auto-cad you can create a straight line at different angle. ALL lines are disconnected to each other witch can be erase separately.
 
   -select command
   -Click on first point of line from where you have to start line.
   -move the mouse in that direction in which you have to draw line.
   -specify length.
   -enter

 LINE COMMAND 

LINE TYPE
Using this command you can convert a line into center-line , hidden line etc.
   -  Click on line type bar
   -  Click on other
   -  Select load tab
   -  Select line that you have to show
   -  Click on ok
   -  Again click on ok tab from line type
   -  Now, select the line that has to change and click on line type from line type bar

LINE WEIGHT
Using this command you can change the width of a line by chose any one of width from line weight bar

By default the line weight is not shown, so go to line weight setting and turned on display line weight

LINE COLOR
Using this in Auto-cad command you can change the color of line

   -  Select line whose color has to be change
   -  Then, click on line color and choose the color

                                                   https://youtu.be/gozjwIdKyE0

POLY-LINE Using this command you can create a 2D poly-line which are connected sequence of line segments,arc segments or a combination of the two.
   -Select command
   -Click on first point of line from where you  have to start line.
   -Move the mouse in that direction in which you have to draw line.
   -Specify length.
   -Enter
   -To draw arc press A
   -And then, specify radius or length of the arc
   -Enter

Poly-line Detail

CONSTRUCTION LINE

 Using this command you can draw a line of infinite length.This command is used as axis line .

Construction Line

MULTI LINE

 Using this command you can draw two or more line together.

 You can change the distance between them from FORMAT MENU> MULTI LINE STYLE 

MULTI LINE

CIRCLE
Using this command you can create different type of circles.
1.

 Circle Command

Select the circle tool by clicking the circle button with cursor or write the ''C" in the command window and press enter.

There are 6 different option in Auto-cad  to draw the circle which are in the following.

Circle Command

Center, Radius:
 You can draw a circle by specifying its radius
 first select the center radius circle drawing option. 
Then select the center of the circle and then put the numerical value of circle radius and press  enter button.

center, radius

Center, Diameter:
You can draw a circle through its diameter
 first select the center radius circle drawing option. Then select the center of the circle and then put the numerical value of circle diameter and press enter button.

Center, diameter

2 point: 
Using this command you can draw a circle by touching two selected points.
 This option is used in Auto-cad  if want to draw a circle that passing through any two points.

2 point circle detaile

3 Point: 
Using this command you can draw a circle by touching 3 selected points.
This option is used if want to draw a circle that passing toughing any three points.

3 point circle

Tan,Tan, radius:
Through this command you can draw a circle by selecting two tangent objects and also you can specify radius of circle.

When there is needed to draw a circle at which two already drawn lines are tangent and also needed the value of circle radius,then we use this option. After selecting this option first we select the first line and then select second line. After that put the value of circle radius by using numerical buttons on keyboard and at the end press enter button.

Tan,Tan, Radius

Tan,Tan,Tan:
Through this you can draw a circle by selecting three tangent objects.

 When there is needed to draw a circle at which three already draw lines are tangent, then we use this option. After selecting this option first we selected the first, second and third line respectively which you want to make tangent on circle. Just after selecting the third line required circle will appear.

                                                https://youtu.be/MsQGkAvGfM 
ARC
To create an arc, you can specify combinations of center, endpoint,start point, radius, angle,chord length, and direction values.
The following prompts are displayed.
TYPE OF ARC

                                                 3-POINT ARC
Using this command you can draw an arc by touching three selected points

                                            START, END ,ANGLE
Through this command you can draw an arc by specifying starting, ending point and also angle between them.

                                            START, END, LENGTH
You can draw a circle using start and end points and the length of the arc.

                                             START, END, RADIUS
You can draw an arc by specifying its start and end points and also its radius.

                                            START, END, DIRECTION
You can draw an arc using its start and end point and the direction in which you want by moving the cursor.

ARC TYPE 

START POINT

Draws an arc using three specified points on the arc's circumference. The first point is the start point.(1)

Note: If you press ENTER without specifying a point, the endpoint of the last drawn line or arc is used and you are immediately prompted to specify the endpoint of the new arc. This creates an arc tangent to the last drawn line, arc, or poly-line.

SECOND POINT

Specify the second point (2) is a point on the circumference of the arc.

END POINT 

Specify the final point (3) on the arc.

start,second,end

You can specify a three-point arc either clockwise or counterclockwise.

RECTANGLE

Using this command in Auto-cad  you can create a rectangular poly-line from the specified the rectangle parameters (Length, width, rotation ).

   -  Select command 

   -  Click on first point of rectangle from where you have to start 

   -  Specify coordinates (x,y) i.e. length and width

   -  Enter

RECTANGLE

POLYGON

Using this command you can create an equilateral closed poly-line where you can specify different parameters as number of sides, inscribed or circumscribed.

   -  Select command 

   -  Specify center point of polygon

   -   Choose number of sides like 6 for hexagon , 5 for pentagon, 8 for octagon etc.

   -  Specify radius of polygon

   -  Enter

POLYGON

ELLIPSE

Using this command you can create an ellipse using a center point, the endpoint of  the first axis, and  the length of the second axis. you can specify the distance by clicking location at the desired distance or by entering a value for the length.

   -  Select command 

   -  Specify center point of ellipse 

   -  Specify major axis of ellipse and then minor axis ellipse 

   -  Enter

ELLIPSE

                                     https://www.youtube.com/watch?v=AJDNWsCss5o
SPLINE

To draw free hand line to show wiring, piping etc

SPLINE

HATCH
Using this command you can fills an enclosed area or selected object with a hatch pattern.
   -  Select command
   -  Select the pattern that you want to fill
   -  Click inside the closed boundary
   -  Specify scale factor if you want to increase or reduce the gape between patterns
   -  Enter

HATCH

GRADIENT
Using this command in Auto-cad you can fills a closed boundary with colors
   -  Select command
   -  Select colors to fill
   -  Click inside the closed boundary
   -  Enter

HELIX
Using this command you can create spring like structure by specifying base and radius.

   -  Select command
   -  Specify center point of helix
   -  Then, specify base and top radius of helix
   -  Then, specify height
   -  Enter