## What is the longest diagonal of an octagon?

In total, an octagon has 20 diagonals; the longest ones are on its axes of symmetry, and they meet at the central point, O, which is also the origin of symmetry….Here are the formulas for the length of the diagonals:

- Short diagonal s = a * √(2 + √2)
- Medium diagonal m = a * (1 + √2)
- Long diagonal l = a * √(4 + 2√2)

### What is the ratio of the shortest diagonal to the longest diagonal in a regular octagon?

Hence, the answer is √2 : 1.

**How do you find the length of the diagonal of an octagon?**

Length of a Diagonal of an Octagon A regular octagon comprises 4 equal diagonals, each of which divides it into two similar pentagons. The formula to calculate their length is given as: L = a √( 4 + 2√2), where a is the length of each side of the octagon.

**How many different length of diagonal does a regular octagon have?**

three different types

The regular octagon, in terms of the side length a, has three different types of diagonals: Short diagonal; Medium diagonal (also called span or height), which is twice the length of the inradius; Long diagonal, which is twice the length of the circumradius.

## How do you find the longest diagonal of a polygon?

Let the length of each side by ‘L’ and the longest diagonal be ‘d’. 3/ Extend line AB through B and end it in a new point Z. The angle between Z and the nearest side of the polygon is the exterior angle of the polygon, which is (360/n)º.

### What is diagonal formula?

The diagonal formula is defined as the formula for diagonals, to find the number of diagonals of different polygons and to find their lengths. The number of diagonal lines of an n-sided polygon = n(n-3)/2 where n is the number of sides. Let’s learn about formulas for diagonals of different polygons.

**What is the length of the longest diagonal?**

Find the length of the long internal diagonal by using the Pythagorean theorem for right triangle ACD: [AC]2 + [CD]2 = [AD]2, where AD is the long internal diagonal we seek. Then let [sqrt(2)]2 + 12 = 2 + 1 = 3, then [AD]2 = [sqrt(3)]2.

**Is diagonal the longest?**

…then the longest diagonal is the same as the diameter of the circumscribed circle – i.e. the circle that goes all the way round the outside. This is because the longest diagonal rather conveniently goes through the centre of the circle.

## How do you find the side length of an octagon with a radius?

Radius or Circumradius Multiply the diameter’s length, the distance from vertex to opposite vertex, by 0.383 to calculate a side’s length. For example, the diameter is 10 inches — 10 inches multiplied by 0.383 results in 3.83 inches.

### What is the side length of a regular octagon?

Side Length – It is the length of each side of the regular octagon. Shortest diagonal – Length of the line joining 2 vertices with 2 vertices in between them Circumcircle radius – Radius of the circumference that contains all 8 vertices of the regular octagon

**What is the length of the diagonal of a hexagon?**

Regular hexagons are comprised of six equilateral triangles; in our question, these triangles each have side length 4 (see diagram). The length of a diagonal is equal to two times the length of the side.

**How do you find the perimeter of a regular octagon?**

Determining the perimeter of a regular octagon is extremely easy. As it has eight edges of equal length, all you need to do is multiply the length of the side by 8: P = 8a. If you don’t know the perimeter, but know the octagon area, you can use the following formula to quickly find the perimeter:

## How many diagonals does a pentagon have?

The formula for the number of diagonals of a polygon is: where n = the number of sides in the polygon. Thus a pentagon thas 5 diagonals. An octagon has 20 diagonals. Kean University, Bachelors, Mathematics.