If you want to improve your class 9 Math, Introduction to Euclids Geometry concepts, then it is super important for you to learn and understand all the formulas.

By using these formulas you will learn about the Introduction to Euclids Geometry.

With the help of these formulas, you can revise the entire chapter easily.

## Introduction to Euclids Geometry Class 9 Maths Formulas

**Point**- a point is that which has no part.**Line**: A line is breadthless length.- The ends of a line are points.
**Surface**: A surface is that which has length and breadth only.**Plane surface**: A plane surface is a surface which lies evenly with the straight lines on itself**Edge**: The edges of a surface are lines.**Straight line**: It is a line which lies evenly with the points on itself.**Axiom**: The basic facts which are taken for granted without proofs are called axiom.**Statement**: A sentence which is either true or false, but both is called a statement.**Theorem**: A statement which requires proof.**Collinear points**: Three or more points are said to be collinear, if they all lie in the same line.**Plane**: A plane is a flat, two dimensional surface that extends infinitely in all directions. Intersecting lines: Two lines land M are said to be intersecting lines if l and M have only one point common.**Playfair Axiom**: Two intersecting lines cannot both be parallel to a same line.**Plane figure**: A figure that exists in a plane is called a plane figure.

**Euclid’s five postulates**

- A straight line may be drawn from any one point to any other point. Note: This postulate tells us that one and only one (unique) line passes through two distinct points.
- A terminated line can be produced indefinitely. This postulate tells us that a line segment can be extended on either side to form a line.
- A circle can be drawn with any center and any radius.
- All right angles are equal to one another.
- If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines if produced indefinitely, meet on that side on which the sum of angles is less than two right angles.

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