
How to construct an equilateral triangle, inscribed in a given circle?

1. 
 Start with the construction of a hexagon inscribed in a circle with the same size as the given circle, and pointing upwards.


2. 
 Draw the connecting line between the angular points of the hexagon just below the horizontal centerline.


3. 
 Draw the connecting line between one endpoint of line 2 and the upper endpoint of the vertical centerline.


4. 
 Repeat step 3 for the other endpoint of line 2.


5. 
 Lines 2, 3 and 4 together form the triangle to be constructed.

