How To Draw An Octagon With Equal Sides
Octagon
Octagon is an viii-sided 2-dimensional geometrical effigy. An octagon consists of eight interior angles and 8 exterior angles. The sum of the interior angles of an octagon is 1080°, and the sum of its exterior angles is 360°. There are xx diagonals in an octagon. Octagons are classified into various types based upon their sides and angles. Let united states learn more about the octagon shape in this article.
| 1. | What is an Octagon? |
| 2. | Types of Octagons |
| 3. | Properties of an Octagon |
| four. | FAQs on Octagon |
What is an Octagon?
An octagon can be defined as a polygon with viii sides, eight interior angles, and eight vertices. When all the sides and angles of an octagon are equal in measurement, it is called a regular octagon. Every polygon is either convex or concave. Convex octagons bulge outwards, whereas concave octagons have indentations (a deep recess). Convex octagons are those in which all the angles point outwards. A regular octagon is an example of a convex octagon. The octagon in which at least one of its angles points inward is a concave octagon.
Octagon Sides
An octagon is a polygon with 8 sides and 8 interior angles. The word 'Octagon' is derived from the Greek word, 'oktágōnon' which means eight angles. That is the reason why information technology is called an octagon.
Types of Octagons
Depending upon the sides and angles, an octagon is classified into the following categories:
- Regular and Irregular Octagon
- Concave and Convex Octagon
Regular Octagon
The octagon that has eight equal sides and eight equal angles is known as a regular octagon.
- In a regular octagon, all the sides are equal in length, and all the angles are equal in measure.
- The interior angles add upward to 1080° and the exterior angles add together upwards to 360°.
- The interior bending at each vertex of a regular octagon is 135°.
Irregular Octagon
An octagon in which the sides and angles are not coinciding is an irregular octagon. In other words, an irregular Octagon has eight unequal sides and eight unequal angles.
- It is an octagon with unequal sides and angles.
- All the interior angles are of dissimilar measure, only their sum is always 1080º.
Convex Octagon
The octagon, which has all its angles pointing outside and no angle pointing inwards is convex. Each bending of a convex octagon is less than 180°.
- Convex octagons bulge outwards.
- None of their interior angles is greater than 180°.
Concave Octagon
The octagon in which one of the angles points inwards is a concave octagon.
- Concave octagons have indentations (a deep recess).
- The interior angles are greater than 180°, that is, at to the lowest degree one angle is a reflex bending.
Backdrop of an Octagon
Hither are a few properties of an octagon that can assistance to place information technology hands.
- An octagon is a polygon with eight sides and eight angles.
- All its interior angles sum up to 1080°
- half-dozen triangles tin exist formed in a regular octagon with the help of diagonals using a common vertex.
- It has 20 diagonals.
Octagon Diagonals
The diagonal of an octagon is the line segment that connects any ii non-next vertices. At that place are 20 diagonals in an octagon. The formula that is used to find the number of diagonals in whatsoever polygon is, Number of diagonals = due north(due north-3)/2; where 'n' represents the number of sides of the polygon. In this case, there are 8 sides in an octagon. After substituting the value of 'n' in the formula, we become, Number of diagonals = north(n-3)/2 = viii(8 - three)/two = (eight × 5)/2 = 20. Therefore, there are 20 diagonals in an octagon.
Angles of an Octagon
There are 8 interior angles and viii exterior angles in an octagon. In a regular octagon, each interior angle is 135°. The sum of an octagon'due south interior angles is 1080°, and the sum of the exterior angles of an octagon is 360°.
- Sum of Interior angles of an Octagon = 135° × eight sides = 1080°
- Sum of Exterior angles of an Octagon = 45° × 8 sides = 360°
Area of Octagon
The area of an octagon is the total space occupied by information technology. The formula to summate the area of a regular octagon is, Surface area of a Regular Octagon = 2a2(1 + √2); where 'a' is any one side length of the octagon. It is expressed in foursquare units similar inchesii, cmii, and and so on. For example, if i side of a regular octagon is 6 units, let us detect the area of the octagon. Expanse of octagon = 2a2(i + √2), Substituting the value of 'a' = 6, Area of octagon = 2 × (half dozen2) × (1 + √2) = 72 × (ane + √ii) = 173.eight square units.
In case of an irregular octagon, there is no specific formula to find its area. We divide the octagon into smaller figures like triangles. Then, after calculating the area of all the triangles, we add their areas to get the area of the octagon.
Perimeter of an Octagon
The perimeter of a polygon is the total length of its purlieus. In order to calculate the perimeter of an octagon, the length of all the sides should be known. We know that in a regular octagon, all the sides are of equal length. Therefore, the formula that is used to find its perimeter is,
Perimeter of an octagon = Sum of all its sides
Perimeter of a regular octagon = 8a (Where 'a' is the length of one side of the octagon)
Important Notes
- An octagon has 8 sides.
- The sum of all the interior angles in an octagon is always 1080º.
- The sum of all the exterior angles in an octagon is always 360º.
- A regular octagon has 20 diagonals.
- Regular octagons are always convex octagons, while irregular octagons can either be concave or convex.
Challenging Questions
- What is the sum of the number of sides, vertices, and angles in an irregular octagon?
a) 10 b) eight c) xxx d) twoscore - What is the number of triangles that can be drawn in a regular octagon by connecting all the vertices?
☛ Related Articles
- Types of Polygons
- Pentagon
- Hexagon
- Heptagon
- Decagon
- Dodecagon
- 3D shapes
Octagon Examples
-
Example 1: How many triangles can be formed past joining the vertices of an octagon?
Solution:
In a regular octagon, by joining one vertex to the remaining non-next vertices, 6 triangles can be formed.
Nevertheless, if nosotros consider all the vertices independently, we would have a total of 632 triangles.
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Exercise Questions on Octagon
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FAQs on Octagon
What is an Octagon in Geometry?
Octagon is an eight-sided two-dimensional geometrical figure which consists of viii interior angles and 8 exterior angles. The name 'octagon' is derived from the Greek discussion 'oktágōnon' which means viii angles.
What are the Angles of an Octagon?
In that location are viii interior angles and 8 corresponding exterior angles in an octagon. In a regular octagon, all the interior angles are of equal measure out and each interior angle measures 135°. Similarly, all the exterior angles are of equal measure and each exterior angle measures 45°. The sum of the interior angles of an octagon is 1080° and the sum of its outside angles is 360°.
What is a Regular Octagon?
A regular octagon is one in which all the sides are of equal length and all the interior angles are of equal mensurate. The sum of its interior angles is 1080° and the sum of its outside angles is 360°.
What is the Perimeter of an Octagon?
The perimeter of an octagon is the total length of its boundary. This can be calculated by adding the side lengths using the formula, Perimeter of octagon = Sum of all its sides. In case of a regular octagon, we use the formula, Perimeter of regular octagon = 8 × Side length, because all the sides are of equal length. The perimeter of an octagon is expressed in linear units similar inches, cm, and so on.
What are the Backdrop of an Octagon?
The following properties of an octagon help the states to identify it easily.
- An octagon has eight sides and eight angles.
- All its interior angles sum upwards to 1080°
- 6 triangles tin be formed in a regular octagon with the help of diagonals using a common vertex.
- It has twenty diagonals.
How to Find the Surface area of an Octagon?
The surface area of an octagon is the total space occupied by information technology. It is calculated with the formula, Area of a Regular Octagon = 2aii(ane + √2); where 'a' is any one side length of the octagon. It is expressed in square units like inchesii, cm2, and and so on. In case of an irregular octagon, there is no specific formula to find its area. We divide the octagon into smaller figures similar triangles. Then, later calculating the area of all the triangles, we add their areas to get the area of the octagon.
How many Triangles are there in an Octagon?
Using a common vertex, and with the assistance of diagonals, 6 triangles can be formed in an octagon. Another way to notice the number of triangles that can exist formed in an octagon is by using the formula, (north - 2), where n = number of sides of the polygon. Here, northward = 8, so subsequently substituting the value of n = 8 in the formula, (n - 2), we get, (eight - ii) = 6. Therefore, vi triangles tin be formed in an octagon.
How to find the Side Length of an Octagon?
The side length of an octagon tin be calculated if the perimeter and the other sides are given. The sum of the given sides can be reduced from the perimeter to become the value of the unknown side. For example, if seven sides of an octagon sum upwardly to 36 units, and the perimeter of the octagon is 42 units, then the missing side = Perimeter - Sum of the remaining sides, which means, 42 - 36 = 6 units. In example of a regular octagon, the perimeter can be divided past 8 to go the value of one side of the octagon. For example, if the perimeter of a regular octagon is 96 units, then the length of one side = Perimeter ÷ 8 = 96/8 = 12 units.
How many Sides are there in an Octagon?
At that place are eight sides in an octagon. When all these eight sides are equal in length, information technology is known as a regular octagon, whereas when even at least ane of the sides is different in measurement, it is known equally an irregular octagon.
Is an Octagon a Quadrilateral?
No, an octagon is not a quadrilateral. A quadrilateral is a closed shape with iv vertices and four sides and an octagon has viii sides and 8 vertices.
Is any 8-Sided Shape an Octagon?
If the shape is airtight, made upward of straight lines, and has 8 sides, we phone call it an octagon.
Do Octagons take Equal Sides?
No, all octagons need non have equal sides. Octagons that have equal sides are known as regular octagons, while irregular octagons accept different side lengths.
How many Diagonal are there in an Octagon?
An octagon has 20 diagonals in all. This can be calculated using the formula, 1/ii × due north × (n - 3), where n = number of sides of the polygon. Here, n = viii, so after substituting the value of n = 8 in this formula, we get, 1/2 × n × (due north - 3) = 1/2 × 8 × (8 - three) = 20. Therefore, in that location are 20 diagonals in an octagon.
How many Parallel Lines does an Octagon take?
A regular octagon has 4 pairs of parallel sides (parallel lines). There are a full of 8 sides in an octagon, and those eight sides are parallel to their respective contrary side in the case of a regular octagon.
Source: https://www.cuemath.com/geometry/octagon/
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