Here we will recall about the basic geometrical concepts.

**Basic Geometrical Concepts: ****Axiom:** It is a proposition that is not proved but considered to be self-evident or subject to necessary decision. Its truth is taken for granted and serves as a starting point for deducing and concluding other truths.

**For Example: **

• Whole is greater than the part.

• Things that are equal to same thing are equal to one another.

**Statement: **It is a question that is definitely true or definitely false.

**For Example: **

• Every triangle has three sides. This statement is true.

• No prime number is even. This statement is false.

**Theorem: ** A formula that is provable without any further assumption is called a theorem. A theorem can be deduced from previously accepted statements such as axiom.

**For Example: **

• In a right angled triangle, the sum of the squares of two sides is equal to the square of the longest side.

**Corollary: ** Result that is trivial or self-evident from a theorem is known as a corollary. Corollary is simply something which we can prove from some other theorem.

**For Example: **

*Theorem:* The sum of interior angles of a triangle is 180°.

*Its corollary:* The sum of interior angles of a quadrilateral is 360°.

● Lines and Angles

**Fundamental Geometrical Concepts**

**Some Geometric Terms and Results**

**Complementary and Supplementary Angles**

**Parallel and Transversal Lines**

**8th Grade Math Practice**** ****From Basic Geometrical Concepts to HOME PAGE**

**Didn't find what you were looking for? Or want to know more information
about Math Only Math.
Use this Google Search to find what you need.**

## New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.