Arc+Edge is the fun and simple way to explore Euclidean geometry constructions.

No more wiggly analog compasses that mess up your constructions. Learn and practice geometry constructions with digital precision.

Simple, clean interface built around discovering and using points. Hide lines and circles you do not need to keep your work free of clutter.

CHALLENGE COMPLETE
Construction attempts are analyzed in realtime and completion of the challenge is recognized automatically. Instant feedback!

STEP-BY-STEP
Exercises have step-by-step walkthroughs to review before attempting.

EUCLID'S ELEMENTS
Build constructions based on the propositions of Euclid's Elements.

COMMON CORE ALIGNED
Covers the high school geometry math content standards involving constructions.

HSG.CO.D.12
Learn and practice copying a segment; copying an angle; bisecting a segment; bisecting an angle; constructing perpendicular lines, including the perpendicular bisector of a line segment; and constructing a line parallel to a given line through a point not on the line.

HSG.CO.D.13
Construct an equilateral triangle, a square, and a regular hexagon inscribed in a circle.

HSG.C.A.3
Construct the inscribed and circumscribed circles of a triangle.

HSG.CO.A4
Construct a tangent line from a point outside a given circle to the circle.