Math Playground
Geometry

Construct 30°, 45°, 60°, 90°

Build the special angles with just compass and ruler.

Compass and straightedge can build the special angles exactly.

Recipes

  • 60° — equilateral triangle (one of its angles).
  • 30° — bisect 60°.
  • 90° — perpendicular at a point.
  • 45° — bisect 90°.