AUTOCAD TUTORIAL: Chapter 2 Introduction Of 2D Drawing Tool > Circle Tool

Circle tool:

Short key: C enter
To draw a circle first select the circle tool by clicking the circle on draw toolbar or by simply press C enter.
Now there are six method to draw a circle which are explain given below.

This method is used when we know the center and radius of the circle
procedure:
• Select Circle tool from the quick access toolbar or press C enter.
• Now specified center point of circle by x,y and press enter. If you don’t have specified location than click anywhere in drawing area.
• Now enter the radius of circle and press enter.
Example:
To draw a circle whose center lies at the origin and radius is 5.
Solution:

C enter              (select the tool)
0,0 enter           (specified center point)

2. Center diameter method:

This method is used when we know the center and diameter of the circle
procedure:
• Select Circle tool from the quick access toolbar or press C enter.
• Now specified center point of circle by x,y and press enter. If you don’t have specified location than click anywhere in drawing area.
• Now press D and enter.
• Now enter the diameter of circle and press enter.
Example:
To draw a circle whose center is (0,2)and diameter is 8.
Solution:

C enter              (select the tool)
0,2 enter           (specified center point)
D enter              (select diameter input option)
8 enter              (specified diameter)

3. Two point method:

This method is used when we know the two points from which the circle pass.
Procedure:
• Select Circle tool from the quick access toolbar or press C enter.
• Now press 2P and enter.
• Now specified these two point by simply clicking the left click of mouse on drawing area. You can also use absolute coordinate by selecting first point by x,y and same as second point.
Example:
To draw a circle which pass from two point (4,0) and (8,0).
Solution:

C enter               (select the tool)
2P enter             (select two point option)
4,0 enter            (specified first point)
8,0 enter            (specified second point)

4. Three point method:

This method is used when we know the two points from which the circle pass.
Procedure:
• Select Circle tool from the quick access toolbar or press C enter.
• Now press 3P and enter.
• Now specified these three point from which circle pass by simply clicking the left click of mouse on drawing area. You can also use absolute coordinate by selecting first point by x,y and same as second and third point point.
Example:
To draw a circle which pass from three point (4,2) , (8,4) and (2,2).

Solution:

C enter               (select the tool)
3P enter             (select three point option)
4,2enter             (specified first point)
8,4 enter            (specified second point)
2,2 enter            (specified third point)

This method is used when we know two tangent of the circle and radius of the circle.
Procedure:
• Select Circle tool from the quick access toolbar or press C enter.
• Now press TTR or T and enter.
• Now specified first and second tangent by clicking on the tangent with the mouse.
• Now enter the radius of circle and press enter.
Example:
To draw a circle which has two tangents line AB and curve PQR and whose radius is 8.
Solution:

C enter                        (select the tool)
TTR OR T enter             (select Tangent-tangent-radius option)
Select the line AB.
Select the curve PQR.

6. Tangent-Tangent-Tangent method:

This method is used when we know three tangent of the circle.
Procedure:
• Select the tangent-tangent-tangent option on drop down menu of the circle on the quick access toolbar.
• Now specified first ,second and third tangent by clicking on the tangent with the mouse.

Example:
To draw a circle which has three tangent line AB, line CD and curve PQR.
Solution:

Setect the circle TTT tool from the quick access toolbar > draw toolbar> circle> drop down menu> TTT.
Seclet line AB.
Select line CD.
Select curve PQR.

Exercise:

Problem 1 : draw a circle whose radius is 8 and center lies at point (4,4).

Problem 2 : draw the following diagram-

Problem 3 : draw a circle which have radius three following tangent
1. line AB which passes from point (3,4) and (6,8).
2. line CD which passes from origin and make angle 45 degree with x axis.
3. line EF which passes from point (0,4) and (0,8).

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