How to Draw a Circle Given Three Points

Given just three points, you can draw the perfect circle. This neat trick can be useful if you’re not able to use a compass or trace around a suitable sized round object.

Edit Steps

1. Start with three points. Draw three points on a piece of paper approximating the size of the circle you wish to draw.


2. Using a straight edge, draw two line segments connecting two points per segment.
   
   
   


3. Draw the perpendicular bisector of the segments you have drawn.
   
   
   
   
   
   
   • The intersection of the perpendicular bisectors is the center of the circle.
   
   
   
   


4. Draw a circle with the radius from the center of the circle to a point given.
   
   
   
   


5. Erase the perpendicular bisectors and draw another line segment connecting the two points, forming a triangle. Or, simply erase all the lines and you have your circle.
   
   
   
   

Edit Related wikiHows

• How to Draw a Circle


• How to Construct a Line Parallel to a Given Line Through a Given Point

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