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Euclidean geometry is the study of shapes and figures on flat surfaces. It’s named after the Greek mathematician Euclid, who explained it in his book called “Elements.” This type of geometry deals with flat things, like sheets of paper.

In Euclidean geometry, we use some basic ideas called axioms or postulates. These are things that we assume to be true without needing to prove them. Euclid introduced these fundamental ideas in his book. He had five main axioms, which we’ll talk about in a bit.

Euclidean geometry is all about studying flat shapes and figures. It’s named after Euclid, the Greek mathematician, and it’s based on some basic ideas called axioms.

## What is Euclidean Geometry?

Euclidean Geometry is a type of math that starts with some basic ideas and builds everything else from them. These basic ideas are called axioms. In Euclidean Geometry, we look at things like points, lines, angles, squares, triangles, and other shapes. That’s why it’s often called “plane geometry,” because it focuses on these flat, two-dimensional shapes.

The main goal of Euclidean Geometry is to study and understand the properties and connections between these different shapes. It helps us explore how these shapes behave and relate to each other. So, in simple terms, Euclidean Geometry is all about understanding and working with the basic building blocks of geometry, like points and lines, to learn more about the world of shapes.

## What is Non-Euclidean Geometry?

Non-Euclidean Geometry is a branch of geometry that explores alternatives to the traditional Euclidean Geometry, which is based on the geometric principles developed by the ancient Greek mathematician Euclid. Unlike Euclidean Geometry, Non-Euclidean Geometry doesn’t adhere to the classical Euclidean axioms and rules.

### Properties of Euclidean Geometry

- It is the study of plane geometry and the solid geometry
- It also defined point, line and a plane.
- A solid has size, shape, position, and also moved from one place to another.
- The interior angles of a triangle can add up to 180 degrees.
- Two parallel lines can never cross each other.
- The shortest distance between the two points is always a straight line.

## Euclidean Geometry postulates

Now let us discuss these Postulates in detail.

### Euclid’s Postulate 1

“A straight line can also be drawn from any one point to another point.”

This postulate defined as “at least one straight line passes through the two distinct points but he did not mention that there cannot be more than one such line. Although throughout his work he also assumed there exists only a unique line passing through the two points.”

### Euclid’s Postulate 2

“A terminated line can be further extended without any limit.”

In simpler terms, when Euclid talked about a ‘terminated line,’ he meant what we now call a ‘line segment.’ So, this idea tells us that we can keep making a line longer by adding more and more points in both directions.

Imagine a line segment like AB. You can see in the picture below that you can keep making it longer by drawing more points and extending it in both directions to make a full line.

### Euclid’s Postulate 3

“You can create a circle by picking any point as its center and choosing any length as its radius”.

When you draw a circle, you can start from any point on its edge or even from the middle. No matter where you begin, the distance from one side of the circle to the opposite side, passing through the center, is called the diameter of the circle. It’s like measuring how wide the circle is.

### Euclid’s Postulate 4

“Every right angle is always the same as any other right angle”.

A right angle is a type of angle that measures exactly 90 degrees. No matter how long the sides are or how the angle is positioned, all right angles are identical to each other. They’re always equal.

### Euclid’s Postulate 5

If a straight line fall into two other straight lines to make the interior angles on the same side of it taken together less than the two right angles, then the two straight lines, if produced indefinitely, meet on the side on which the sum of angles is less than the two right angles.

#### Related Information

## Frequently Asked Questions (FAQs)

### What are all the rules of Euclidean geometry?

Euclidean geometry is based on a set of axioms and postulates that form the foundation for its rules and principles. These rules include properties of points, lines, angles, and shapes, as well as theorems derived from these axioms. Some fundamental rules include the parallel postulate, the Pythagorean theorem, and the congruence and similarity principles.

### What are the 7 axioms of Euclid?

Euclid's Elements, a foundational work in geometry, is based on five postulates (axioms) and five common notions. The seven axioms that are often referred to are: A straight line can be drawn between any two points. A finite straight line can be extended indefinitely. A circle can be drawn with any center and any radius. All right angles are equal to each other. If a straight line falling on two straight lines makes the interior angles on one side less than two right angles, the lines will meet on that side. Things that are equal to the same thing are equal to each other. If equals are added to equals, the wholes are equal.

### What are the three types of geometry?

The three main types of geometry are Euclidean geometry, non-Euclidean geometry, and projective geometry. Euclidean geometry deals with flat, two-dimensional space and is based on the axioms of Euclid. Non-Euclidean geometry includes hyperbolic and elliptic geometries, where the parallel postulate is modified, leading to curved spaces. Projective geometry focuses on the properties of geometric objects that remain invariant under projective transformations.

### What are the 5 basic postulates of Euclidean geometry?

Euclidean geometry is typically based on five postulates, which include: A straight line can be drawn between any two points. A finite straight line can be extended indefinitely. A circle can be drawn with any center and any radius. All right angles are equal to each other. If a straight line falling on two straight lines makes the interior angles on one side less than two right angles, the lines will meet on that side.

### What are the 4 postulates of Euclidean geometry?

Euclid's original postulates were presented as five, but some versions consolidate them into four postulates. These four postulates are: A straight line can be drawn between any two points. A finite straight line can be extended indefinitely. A circle can be drawn with any center and any radius. All right angles are equal to each other.

### Why is Euclidean geometry important?

Euclidean geometry is important because it laid the foundation for much of modern mathematics and science. It introduced rigorous logical reasoning and deductive methods, which became a model for mathematical thinking. Euclidean principles are used in various fields, including physics, engineering, architecture, and computer graphics, to solve real-world problems and make accurate measurements.

### What is the point of Euclidean geometry?

The main purpose of Euclidean geometry is to study and describe the properties of flat, two-dimensional space and the relationships between geometric objects within that space. It provides a systematic framework for understanding and solving problems related to lines, angles, shapes, and spatial relationships. Additionally, it serves as a model for logical reasoning and proof in mathematics.