With four, you make a square, you make a pentagon, you make a hexagon, you make all these kind of polygons.

Pentagon

A pentagon

Look at the pentagon, for instance, pull this out it becomes a boat shape trapezium.

Studying pollen grains and radiolaria and carbon molecules helped us devise the most efficient structural solution using hexagons and pentagons.

This polygon is convex.

This polygon is not convex.

Splines

Scanlines

Outlines

Spookiness

Check whether this polygon is convex

Sides of a Polygon

The sides of a polygon.

Intersect this polygon with another polygon

An hexagon has six sides.

Construct the sides of this polygon...

Boundary Polygonal

Select the polygon of which you want the intersection with another polygon...

Polygon Click this to start drawing a polygon.

Test whether a given polygon is convex

Open Boundary Polygonal

Construct the sides of this polygon

Poly

Hexagon

Polygons

Polytopes

Poly corners

Polygon count

polygon

quadrilateral

Polygon

A hexagon

A polygon that corresponds to the convex hull of another polygon

Select the polygon you want to test for convexity...

Intersect this Polygonal

with this Polygonal

Polygons

KPolygon

Hopalong

Rounded corners

Freehandpolygon Click this to start drawing a freehand polygon.

Hopalong

Equilateral Triangle

Control polygon