# Hexagon

A hexagon is a 6-sided polygon (a flat shape with straight sides).

## Regular or Irregular

When all angles are equal and all sides are equal it is **regular**, otherwise it is** irregular**:

Regular Hexagon | Irregular Hexagons |

## Concave or Convex

A **convex** hexagon has no angles pointing inwards. More precisely, no internal angles can be more than 180°.

When any internal angle is greater than 180° it is **concave**. (*Think: concave has a "cave" in it*)

Convex Hexagon | Concave Hexagon |

## Is it a Hexagon?

No curved sides. And the shape must also be **closed** (all the lines connect up):

Hexagon(straight sides) |
Not a Hexagon (has a curve) |
Not a Hexagon (open, not closed) |

## Properties

A **regular** hexagon has:

- Interior Angles of
**120°** - Exterior Angles of
**60°** - Area =
**(1.5√3) × s**, or approximately^{2}**2.5980762 × s**(where s=side length)^{2}

Soap bubbles tend to form hexagons

when they join up.

Honeycomb has hexagons too!