A heptagon is a polygon that has actually seven political parties (Hepta- method seven). In the figure below are several varieties of heptagons.

You are watching: How many triangles in a heptagon

## Heptagon classifications

Like other polygons, a heptagon have the right to be share as continuous or irregular. If every the sides and interior angles of a heptagon room equal, it is a continual heptagon. Otherwise it is an irregular heptagon.

Regular heptagonIrregular heptagonAll sides and also interior angles space equal | Not every sides and angles space equal |

Heptagons and other polygons can likewise be classified together either convex or concave. If all interior angles that a disappear are much less than 180°, the is convex. If one or an ext interior angles is bigger than 180°, it is concave. A regular heptagon is a convex heptagon. A concave disappearance is an rarely often rare heptagon.

Convex heptagonConcave heptagonAll internal angles 180° |

## Diagonals of heptagon

A diagonal is a heat segment joining two non-consecutive vertices. A full of fourteen distinct diagonals can be drawn for a heptagon. The following figure is an example.

There space 4 diagonals prolonging from every of the 7 vertices of the heptagon over creating a complete of 14 diagonals.

## Internal angles of a heptagon

The amount of the inner angles the a heptagon equals 900°.

As shown in the figure above, 4 diagonals can be attracted to divide the disappear into five triangles. The blue lines over show simply one way to divide the heptagon into triangles; there are others. The amount of inner angles the the 5 triangles amounts to the amount of internal angles that the heptagon. Due to the fact that the amount of the interior angles the a triangle is 180°, the amount of the inner angles the the heptagon is 5 × 180° = 900°.

## Regular heptagon

A continuous heptagon is a heptagon in which every sides have equal length and also all interior angles have equal measure.

### Angles that a constant heptagon

Since every of the seven inner angles in a continuous heptagon room equal in measure, each inner angle measures 900° ÷ 7 ≈ 128.57°, as presented below.

Each exterior angle of a regular heptagon has actually an same measure that is roughly 51.43°.

See more: How To Get Rid Of Snow In Minecraft, How Can I Permanently Get Rid Of Snow

### Symmetry in a constant heptagon

A consistent heptagon has 7 currently of symmetry and a rotational symmetry of stimulate 7, definition that it have the right to be rotated in together a method that it will certainly look the same as the initial shape 7 time in 360°.

Lines of symmetryRotational symmetry7 present of symmetry | Seven 51.43-degree angles of rotation about the center |