Here’s another entry from my Fun With Folding series: folding the circumcenter of a triangle! The circumcenter of a triangle is the center of the triangle’s circumscribing circle.
To fold your way to the circumcircle, use the perpendicular biscctor fold three times to construct the perpendicular bisector of each side of the triangle. (Click here to find instructions for these basic folds.)
Be sure to try some other fun mathematical activities with folding!
Have more Fun With Folding!