Circle Touching 3 Points

How to construct a Circle touching 3 Points
using just a compass and a straightedge

Steps:

  • Join up the points to form two lines
  • Construct the perpendicular bisector of one line
  • Construct the perpendicular bisector of the other line
  • Where they cross is the center of the circle
  • Place compass on the center point, adjust its length to reach any point, and draw your circle!

Note: this is the same method as Circumscribe a Circle on a Triangle