Compass & Ruler
Construct geometry with a digital compass and ruler
Practice geometric construction with points, lines and circles and their intersections. Grow regular polygons from a fixed side; all their sides and angles remain equal.
Key idea
A construction uses geometric relationships rather than approximate appearance. A compass preserves a radius; a straight line connects points. Their intersections let you build new points from constraints you already know.
Try this first
Draw a line between two points and use it as one fixed side of a regular polygon. Drag to choose the direction and number of sides, then inspect the result. Add circles or intersections to continue the construction.
How to get started
- Pick the compass or ruler tool.
- Tap points to draw circles and lines.
- Build classic constructions step by step.
Explore a little further
Try another experiment
Draw a segment and circles centered on its endpoints, each with a radius equal to the segment. Connect an intersection to both endpoints to form an equilateral triangle. Compare this with a regular triangle made using the polygon tool.
Good to know
Save a workspace on your current device before leaving. The construction view supports snapping, undo and redo; a saved local workspace is not automatically a shared cloud document.
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