# What is a Tetrahedron? What is a Tetrahedron?

In mathematics, there are different types of shapes such as triangles, polygons, rectangles, and so on. Likewise, a tetrahedron can be defined as a geometrical shape which is a type of pyramid consisting of four triangular faces or sides. It can also be regarded as a shape that is three-dimensional and has faces that are triangular. Therefore, a tetrahedron is also known as a triangular pyramid. It consists of 4 faces which are triangular, 4 vertices, and 6 edges.

The measure of all the interior angles is about 60 degrees and the addition of interior angles results in the value of 180 degrees. In this article, we will try to cover some basic concepts regarding the tetrahedron such as properties of tetrahedra, the formula for the volume, and lateral surface area of volume.

## Polygon

Have you ever imagined that the laptop which you are using or the television or the rectangular football pitch where you play is of which shape? Let me tell you, all these objects or real-life examples are polygons in shape. In geometry, a polygon can be defined as a figure which is two-dimensional having more than 2 straight lines. This word  ‘polygon’ has been derived or excavated from the words of Greek where ‘poly’ signifies many and ‘gon’ means an angle, if we add these two terms, polygon = many angles.

There are various types of polygons that are classified on the basis of the number of the sides, the measures of angle, and the boundary of it. Some of them are as follows: pentagon, octagon, hectagon, hexagon, and many others. In the next few sections, we shall see some features or characteristics of a polygon that differs it from any other shape.

## Some Significant Properties of Tetrahedron

As mentioned above, a tetrahedron can be defined as a geometrical shape which is a type of pyramid consisting of four triangular faces or sides. Like every other shape, a tetrahedron also possesses some significant properties. The following points analyze the important properties of a tetrahedron.

• A tetrahedron is a type of pyramid which is made up of 4 faces, 4 vertices, and 6 edges. A vertex of a tetrahedron can be defined as the highest point of a tetrahedron or where the straight lines of a tetrahedron intersect with each other.
• In a tetrahedron that is regular in nature, you may observe that all the vertices (total four) are in a position such that they are equidistant from one another. The term ‘equidistant’ basically signifies that all the sides are at equal distances.
• A tetrahedron consists of six planes of symmetrical lines. The planes of symmetry can be defined as the plane (imaginary in nature) which bisects the shape into equal halves. In a tetrahedron, we may see 6 equal halves.
• A tetrahedron may consist of four triangles which are equilateral in nature. The equilateral triangles are the types of triangles whose angle measures about 60 degrees. The sum of all these angles results in 180 degrees (60 + 60 + 60 = 180).

## How to Identify a Regular Polygon?

In order to identify or determine a regular polygon, you must know some of the properties which make it different from others and easier for you to recognize. The following points analyze the properties of a regular polygon:

• A regular polygon is a shape that is closed. The initial and terminal points of a polygon are the same.
• Polygon is made up of lines that are straight or the line segments.
• A polygon consists of three or more than three sides.

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What is a Tetrahedron?