## What are the inside angles of an octagon?

Octagon

Regular octagon | |
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Symmetry group | Dihedral (D8), order 2×8 |

Internal angle (degrees) | 135° |

Dual polygon | Self |

Properties | Convex, cyclic, equilateral, isogonal, isotoxal |

### How many lines of reflection does a octagon have?

8 lines

Answer: A regular octagon has 8 lines of symmetry.

#### How do you find the angles of an octagon?

An octagon has eight sides, so the sum of the angles of the octagon is 180(8 – 2) = 180(6) = 1080 degrees. Because the octagon is regular, all of its sides and angles are congruent. Thus, the measure of each angle is equal to the sum of its angles divided by 8.

**Does an octagon have 4 lines of symmetry?**

A regular octagon (sides and angles equal) has eight lines of symmetry.

**Does an octagon have perpendicular lines?**

How many sets of parallel and perpendicular lines are there in a regular octagon? A regular octagon is made up of eight sides of the same length, and eight congruent angles (all of which measure 135°). We can see that lines a and d are perpendicular to both e and h.

## Why does an octagon have 8 lines of symmetry?

A regular octagon has 8 lines of symmetry and a rotational symmetry of order 8. This means that it can be rotated in such a way that it will look the same as the original shape 8 times in 360°….Symmetry in regular octagons.

Lines of symmetry | Rotational symmetry |
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8 lines of symmetry | Eight 45°angles of rotation |

### How many axes of symmetry has an octagon?

8 Lines

Regular Polygons

An Equilateral Triangle (3 sides) has 3 Lines of Symmetry | |
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A Regular Pentagon (5 sides) has 5 Lines of Symmetry | |

A Regular Hexagon (6 sides) has 6 Lines of Symmetry | |

A Regular Heptagon (7 sides) has 7 Lines of Symmetry | |

A Regular Octagon (8 sides) has 8 Lines of Symmetry |

#### What is the order of an octagon?

A regular octagon has 8 lines of symmetry and a rotational symmetry of order 8.

**What are the sides of a regular octagon?**

A regular octagon is a closed shape with sides of the equal length and interior angles of the same measurement. It has eight symmetric lines and rotational equilibrium of order 8. The interior angle at each vertex of a regular octagon is 135°. The central angle is 45°.

**What is the sum of the interior angles of an octagon?**

The sum of the interior angles of an octagon equals 1080°. As shown in the figure above, five diagonals can be drawn to divide the octagon into six triangles. The blue lines above show just one way to divide the octagon into triangles; there are others.

## How do you divide an octagon into six triangles?

As shown in the figure above, five diagonals can be drawn to divide the octagon into six triangles. The blue lines above show just one way to divide the octagon into triangles; there are others. The sum of interior angles of the six triangles equals the sum of interior angles of the octagon.

### How are the lines of reflection colored in an octagon?

Lines of reflections are blue through vertices, purple through edges, and gyration orders are given in the center. Vertices are colored by their symmetry position. The regular octagon has Dih 8 symmetry, order 16. There are 3 dihedral subgroups: Dih 4, Dih 2, and Dih 1, and 4 cyclic subgroups: Z 8, Z 4]