Geometry Definition: Lesson for Kids

Instructor: Allison Petrovic

Allison has experience teaching high school and college mathematics and has a master's degree in mathematics education.

Geometry is a very interesting topic in mathematics. We will learn the definition of geometry in this lesson. We will also look at some real life examples of geometry!

Definition of Geometry

Believe it or not, math is more than just numbers. Think about your last birthday cake. Was it in the shape of a square, rectangle, or circle? Squares, rectangles, and circles are just some examples of shapes. All of these shapes are topics that we can learn about in geometry!

Circular Birthday Cake
Circular Birthday Cake Image

Geometry is a kind of math where we can learn all about points, lines, and shapes. For this lesson, let's break down this definition and study it in difference pieces. Let's start with points!


If you were to draw a dot on a sheet of paper with a pencil you have what we call a point in geometry. You may remember connecting the numbered dots in order to trace a picture when learning to draw. All of those dots that you connected were points!


If you were to draw two points on a sheet of paper and connect them by using a ruler, you have what we call a line in geometry! It is important to use a ruler so the line does not have any gaps or curves! Lines do not have any gaps or curves, and they don't have a specific length. Let's think about a standard piece of paper. The edges of the piece of paper are lines because they are straight, without any gaps or curves. There is also one red line and several blue lines on a piece of paper!

Triangular Yield Sign
Yield Sign

To unlock this lesson you must be a Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use

Become a member and start learning now.
Become a Member  Back
What teachers are saying about
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account