Sides and Vertices of Shapes
Basics on the topic Sides and Vertices of Shapes
Vertex Geometry – Sides and Vertices
Most 2D shapes have sides and vertices. So what are sides and vertices? Let’s find out all there is to know about sides and vertices in this text. A side is a straight line that makes up a closed 2D shape.
A vertice, or vertex when we are talking about just one, is where two sides meet to form a corner.
Sides and Vertices on Squares and Trapezoids
Squares and trapezoids are a type of quadrilateral. How many sides and vertices does a quadrilateral have? Quadrilaterals have 4 sides and 4 vertices, so when someone asks you what shape has 4 sides and 4 vertices, you can tell them all quadrilaterals do! Therefore, a square and trapezoid are examples of a shape with 4 sides and 4 vertices.
Sides and Vertices on Pentagons
How many sides and vertices does a pentagon have? A pentagon is a shape with 5 sides and 5 vertices, so when someone asks you what shape has 5 sides and 5 vertices, you can tell them pentagons do!
Sides and Vertices on Circles
How many sides and vertices does a circle have? A circle is a special case, because it has 0 sides and 0 vertices, so when someone asks you what shape has 0 sides and 0 vertices, you can tell them a circle!
Sides and Vertices of 2D Shapes – Summary
Most shapes have sides and vertices. You can use these to help identify 2D shapes. A side is a straight line that makes up a closed 2D shape. A vertice, or vertex, is where two sides meet to form a corner. In this text we learned that squares and trapezoids have four sides and four vertices, whereas a pentagon has five each. How many sides and vertices does a triangle have? Triangles have three sides and three vertices, hence the name tri (=three). The table below shows an overview of shapes, their number of sides and their vertices.
Name of the Shape  # of Sides and Vertices 

triangle  3 
square, rectangle, trapezoid  4 
pentagon  5 
hexagon  6 
If you want more you will find interactive exercises, worksheets and more activities on sides and vertices on two dimensional shapes after the video.
Transcript Sides and Vertices of Shapes
Nico has found an old game console in the attic. "Ohh, what is this?" "Hmm. I wonder?" It looks like a game has started on the console! However, Nico needs to learn about sides and vertices of 2D shapes to play the game. To help Nico play the game, let's learn about sides and vertices of 2D shapes. A 2D shape is a flat closed shape that almost always has sides and vertices. What are sides and vertices? Sides are the straight lines that form a shape, like all of these sides here. Vertices are the corners where two straight lines meet, like all of these corners here. If we talk about one corner, we call it a vertex. If we talk about more than one corner, we call them vertices. Knowing the number of sides and vertices a shape has can help you to identify shapes, or classify them into shape families! For example, this square has four sides and four vertices. A quadrilateral, like this square, always has four sides and four vertices! Now we have learned about sides and vertices, let's look at some different shapes. Here is a trapezoid. How many sides does it have? There are four sides. How many vertices does it have? There are four vertices. A trapezoid always has four sides and four vertices, which also makes it a part of the quadrilateral family. You might notice there are different shapes that share the same number of sides and vertices. Next we have a pentagon. How many sides and vertices does a pentagon have? There are five sides and five vertices! A pentagon always has five sides and five vertices. Some shapes are an exception to the rule that all 2D shapes have sides and vertices. One of them is this shape, which is a circle! What do you notice about the sides and vertices of this circle? There are zero sides and zero vertices. A circle will never have any sides or vertices. While Nico continues to play the Shape Mayhem game, let's review! Remember, a 2D shape almost always has sides and vertices. Sides are the straight lines that form a shape. Vertices are the corners where two straight lines meet. Some shapes are an exception to the rule that all 2D shapes have sides and vertices, and one of them is a circle. "Huh?" "I think that's enough game time for today, Nico!" "Oh, you're right! Let's do something else now!" "You were right Nia! Playing outside is much more fun!
Sides and Vertices of Shapes exercise

What are sides and vertices?
HintsThis shape has 3 sides. They are marked with light blue here.
This shape has 3 vertices. Each vertex is shown in dark blue here.
SolutionThe square has 4 sides (the straight lines that form the shape) and 4 vertices (the points where the sides meet).

Where are the vertices?
HintsThere are seven vertices to find in total.
The vertices are the points where the straight sides meet.
There are three vertices in the triangle, and four vertices in the trapezoid.
SolutionHere are the vertices that are on the shapes on Nico's game.

Investigating 2D shapes.
HintsRemember that a circle is the only shape with zero sides and zero vertices.
Count how many sides the shape has. These are the straight lines that form the shape.
The vertices are the point where two straight sides meet.
Solution The circle has no vertices or sides.
 The triangle has 3 sides and 3 vertices.
 The square has 4 vertices and 4 sides.
 The pentagon has 5 vertices and 5 sides.

Quadrilaterals.
HintsRemember that all quadrilaterals have four sides and four vertices.
Only 2D shapes (flat) can be quadrilaterals.
SolutionAll the 2D shapes that have 4 sides and 4 vertices are quadrilaterals.
These are: square, rectangle, parallelogram and trapezoid.

How many sides can you see?
HintsRemember that a circle is the only 2D shape with zero sides and zero vertices.
The squares has four sides.
SolutionIn total, there are 17 sides.
 1 circles = 0 sides
 3 triangles = 9 sides
 1 square = 4 sides
 1 trapezoid = 4 sides

What shape am I?
HintsRemember that the sides are the straight lines that form the outside of a 2D shape.
Remember that vertices are where the two sides of a 2D shape meet.
This is a hexagon.
Solution1) I am a 2D shape. I am special as I am the only 2D shape with 0 vertices and 0 sides. What am I? I am a circle.
2) I am a closed 3 sided shape. I also have 3 vertices. What am I? I am a triangle.
3) I am a hexagon. I have an equal number of sides and vertices. If you add together my sides and vertices it totals 12.
4) I am a closed shape with fewer sides than a pentagon and more than 3 vertices. What am I? I am a quadrilateral.
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