Compass & Protractor — Construction Lab

Your only measuring tools: a compass (lengths) and a protractor (angles). Draw with dots and a ruler.

Tools

Level 1 — Bisectors

Level 2 — Figures

Color

A

Style

Edit

View

Scroll to zoom · drag with middle mouse or hold Space + drag to pan.

What to do now

Pick the Dot tool and click anywhere to place a point.

Challenges

① Equilateral triangle Two circles of equal radius cross. Where?
② Perpendicular bisector Cut a segment exactly in half — no ruler marks.
③ Regular hexagon Why does the radius fit 6 times around a circle?
④ Copy a 50° angle Use the protractor, then recreate it elsewhere.

Legend

Blue dots = points  ·  Green = snap to a crossing
Dashed circle = compass radius preview