
How to construct a Vesica Pisces (two equal circles passing through each other's center), given one circle?

1. 
 Determine the given circle.


2. 
 Draw the horizontal and vertical centerlines of circle 1.


3. 
 Construct a circle centered at one of the intersections of a centerline and circle 1 (in this case, the righthand intersection of the horizontal centerline), passing through the center of circle 1.


4. 
 Circles 1 and 3 together make up the Vesica Pisces, they are equal and pass through each other's center.

