Circumcircle of a Triangle
Geometry construction using a compass and straightedge
of a triangle is the circle that passes through all three vertices of the triangle. The construction first establishes the circumcenter and then draws the circle.
of a triangle is the point where the
of the sides intersect. This page shows how to construct (draw) the circumcircle of a triangle with compass and straightedge or ruler. This construction assumes you are already familiar with Constructing the Perpendicular Bisector of a Line Segment.
Printable step-by-step instructions
The above animation is available as a
printable step-by-step instruction sheet, which can be used for making handouts
or when a computer is not available.
Try it yourself
Click here for a printable worksheet containing two triangle circumcircle problems.
When you get to the page, use the browser print command to print as many as you wish. The printed output is not copyright.
Constructions pages on this site
Circles, Arcs and Ellipses
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