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Counting Corners and Sides

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Counting Corners and Sides
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Basics on the topic Counting Corners and Sides

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In this Video on Shapes Sides and Corners

Nico and Nia are at the store picking out a new attic window. They are admiring a stained glass window when they notice all the different lines and corners that make up the picture in the window. In this kindergarten geometry video, Nico and Nia learn all about the corners and sides of shapes and how to count them.

Sides and Corners of 2D Shapes

Let’s learn more about sides and corners of shapes and how to count the corners and sides of shapes with the following explanation.

What Is the Definition of Corners and Sides in Geometry in 1st Grade?

Sides and corners can be found in many shapes. A corner is the spot where lines join together. Corners can face in or face out.

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Sides are the straight lines that make the edge of a flat shape. Many shapes get their names from how many corners and sides they have. Counting corners and sides can help us figure out what kind of shape we are looking at!

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Let’s practice counting all the corners and sides on the shape below. Remember, a corner is where two straight lines meet. So, this shape has three corners!

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A side is the straight line that makes the edge of a flat shape. So, this shape has three sides!

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Does a Circle have Sides and Corners?

A circle does not have any corners or sides. Let’s look at this round shape as an example.

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There are no straight lines in this shape. So, there is no place for any straight lines to meet! That means this shape has zero corners. Since there are zero straight sides, this shape has no sides either!

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Summary: What Are Sides and Corners?

  • A corner is the spot where straight lines join together.

  • A side is the straight line that makes the edge a flat shape.

  • Many shaped are made up of corners and sides.

  • Counting corners and sides can help us know which shape we are looking at.

Practice: Sides and Corners Worksheets

Have you tried an activity worksheet on how many sides and corners shapes have? On this website, you can also find sides and corners worksheets and exercises.

Transcript Counting Corners and Sides

Nico and Nia are window shopping for a new attic window! "Wow, how beautiful!" "Look at all the different lines and corners that make up the picture!" "I wonder how many there are?!" Let's help Nico and Nia by learning about "Counting Corners and Sides!" A corner is the spot where lines join together. Corners can face out like this or face in like this. Sides are the straight lines that makes the edge of a flat shape. A circle does not have any corners or sides. But, many other shapes do! Shapes can also get their names from how many corners and sides they have. Counting corners and sides can help us figure out what kind of shape we are looking at! Let's look at this beautiful window and count all the corners and sides on this shape. Remember, a corner is where two straight lines meet. So, this shape has one, two, three corners! A side is the straight line that makes the edge of a flat shape. So, this shape has one, two, three sides! Here is another shape from the window. How many corners can we count here? Let's count together: one, two, three, four, five! It has five corners. How many sides can we count here? Let's count together: one, two, three, four, five! It has five sides. Nia points to another shape. What about this one? How many corners and sides does it have? There are no straight lines in this shape. So, there is no spot for any to meet! That means this shape has zero corners. How many straight sides does this shape have? Zero! That means that this shape has no sides either! "We'll order this one." While Nico and Nia wait for their new window to come, let's remember. Today we learned about counting corners and sides. A corner is the spot where straight lines join together. A side is the straight line that makes the edge a flat shape. Many shapes are made up of corners and sides. Counting corners and sides can help us know which shape we are looking at. "I'm so happy the window finally got here!!" "I can't think of anything more perfect!" "Me either!"

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    From Katiecarter7924, before about 20 hours

Counting Corners and Sides exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Counting Corners and Sides .
  • Can you match the shape with the correct number of corners and sides?

    Hints

    In red are the corners of this shape.

    In red are the sides of this shape.

    Remember:

    • corners are the points where two sides join together.
    • sides are the straight lines that form the edge of a flat shape.

    Solution
    • Corners are the points where two sides join together.
    • Sides are the straight lines that form the edge of a flat shape.
    Shapes
    • The triangle has three corners and three sides.
    • The rectangle has four corners and four sides.
    • The hexagon has six corners and six sides.
    • The octagon has eight corners and eight sides.
  • How many corners and sides does each of these shapes have?

    Hints

    Remember:

    • sides are the straight edges that make a shape.
    • corners are the points where two sides meet.

    Here we can see that this triangle has three corners.

    Here we can see that this triangle has three sides.

    Solution
    • Corners are the points where two sides join together.
    • Sides are the straight lines that form the edge of a flat shape.
    Shapes
    • The yellow star has ten corners and ten sides.
    • The blue flag has five corners and five sides.
    • The purple shape has six corners and six sides.
    • The green square has four corners and four sides.
  • Can you find the shapes?

    Hints

    Count the number of corners - the points where two sides meet.

    Count the number of sides - the straight lines that form the edge of a flat shape.

    Solution

    Here we can see the correctly highlighted window.

    Remember:

    • Corners are the spots where two sides join together.
    • Sides are the straight lines that form the edge of a flat shape.

  • Which group should the shapes be assigned to?

    Hints

    Count the number of corners - the points where two sides meet.

    Count the number of sides - the straight lines that form the edge of the shape.

    For example, this square has 4 corners and 4 sides so would be assigned to the first group.

    Solution

    Here we can see which group each shape goes into.

    Remember:

    • Corners are the spots where two sides join together.
    • Sides are the straight lines that form the edge of a flat shape.

  • Can you label the shape correctly?

    Hints

    Sides are the straight edges that form the shape.

    A corner is the point where two sides meet.

    Solution

    • A corner is the spot where two sides join together.
    • A side is the straight line that forms the edge of a flat shape.
    This triangle has three corners and three sides.

  • Can you order the shapes?

    Hints

    Find the shape with the fewest corners and sides, and put this first.

    Compare each shape to the one above it, and move it up or down so it is in the correct position.

    You could make a note of how many corners and sides each shape has, and then order them.

    Solution

    Here we can see how many sides and corners each shape has.

    • Orange triangle: 3 corners and 3 sides
    • Pink parallelogram: 4 corners and 4 sides
    • Green shape: 5 corners and 5 sides
    • Blue shape: 6 corners and 6 sides
    • Yellow shape: 7 corners and 7 sides
    • Red shape: 8 corners and 8 sides