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Math for Kids23 chapters | 325 lessons

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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.

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.

**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!

**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.

A **solid figure** is a three-dimensional shape, like a cube or cone. These shapes are made of flat or curved faces, edges where the faces come together, and vertices. The vertices of a solid figure are points where the edges connect and create a corner. Find a tissue box in your house. This is a solid figure, because it has rectangular faces and is three dimensional. It is known as a rectangular prism. Now touch the points on the tissue box. Each point is a vertex - it's where the flat faces of the box and the edges come together in a point. If you counted eight vertices, you are correct!

Vertices are all around us. We can find them in angles, where two lines or rays come together to make a point. We can also find vertices in plane figures, or shapes that we recognize. Each corner or point on a shape represents a vertex. Finally, we can find vertices when we examine three dimensional shapes, or solid figures. On these figures, vertices are where edges and faces connect to create a point.

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22 in chapter 2 of the course:

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Math for Kids23 chapters | 325 lessons

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- Surface Area Lesson for Kids
- Types of Angles: Lesson for Kids
- Types of Triangles: Lesson for Kids
- Geometric Shapes: Lesson for Kids
- Isosceles Triangle Lesson for Kids
- How to Use a Protractor: Lesson for Kids
- 3-D Shapes: Lesson for Kids
- Pentagon Shapes: Lesson for Kids
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- Circumference Lesson for Kids: Definition & Formula
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- Properties of a Circle: Lesson for Kids
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- Triangle Lesson for Kids: Definition & Facts 3:06
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- How to Find the Area of a Triangle: Lesson for Kids
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- Facts About Right Angles
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- Perimeter Lesson for Kids: Definition & Examples
- 4-Sided Polygons 3:55
- Dodecahedron: Definition & Facts
- Special Right Triangles: 3-4-5 Triangle
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- Dodecahedron: Patterns & Properties
- Finding the Area of an Irregular Hexagon 3:38
- How to Divide an Angle into Two Equal Angles
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