Vertices: Lesson for Kids

Instructor: Jennifer Lowery

Jennifer has taught elementary levels K-3 and has master's degrees in elementary education and curriculum/instruction and educational leadership.

Vertices are everywhere! Geometry includes lines, shapes, and solid figures, and all of these can make or have vertices. In this lesson, learn the definition of a vertex and the different ways we can identify and describe vertices in geometry.

Vertices - What Are They?

Look around the room where you are currently sitting. Did you know that you are surrounded by examples of geometry? Find places where two lines or edges come together, like the corner of a desk, the points on a picture frame, the corners on a tissue box. These are examples of vertices. A vertex is the singular form of this word, and it represents the location where two or more lines or edges are connected.

Vertices Found in Angles

Angles are created when two lines or rays come together to form a point. The point where the lines or rays connect is called a vertex. The vertex can be small or big, depending on how far apart the lines or rays are.

Acute angles are angles that measure smaller than 90 degrees. The vertex in an acute angle will be small because the lines are closer together. Obtuse angles measure larger than 90 degrees; in these angles, the vertex will be larger since the lines or rays are farther apart. A right angle measures exactly 90 degrees. You can fit a perfect square inside of this vertex. It looks a lot like the letter L!

Rays come together to create an acute angle and a small vertex.
Rays and vertex

Plane Figure Vertices

Plane figures are flat shapes that have more than one side. Triangles, squares, and trapezoids are a few examples of plane figures. These figures are created using lines, and there are places where the lines intersect, or connect. A common way to describe them would be corners. For example, a square has four vertices, or corners, since there are four places where the sides connect to each other. A triangle has three vertices. The more sides a shape has, the more vertices it also has.

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