# Circles

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Team Digital
Circles
CCSS.MATH.CONTENT.1.G.A.1

### Contents

#### What are Attributes of a Circle?

Attributes are characteristics that shapes have to help us put them into categories. Attributes of circle can be classified as defining or non-defining.

#### What are the Defining Attributes of a Circle?

A curved line that is round, has no sides, no corners, and an equal distance from the center is a circle.

#### What are the Non Defining Attributes of a Circle?

A circle can be any size, color or face in any direction.

#### In this Video

Nico and Nia are at the arcade and see a claw machine. They notice their prizes all have a round shape and have the attributes of a circle. We find the answer to the question, ‘what are the characteristics of a circle’ as Nico and Nia try to go for one more circle prize!

Following the video, there are attributes of a circle 1st grade exercises and worksheets.

### TranscriptCircles

“Nico, look at all those fun prizes in that machine!” “Do you think you can pick one up with the claw?” “Looks tricky, (...) but let’s give it a try!” Nico pulled two prizes out of the claw machine. A play clock... and a frisbee. “These two prizes are different, but the outside shape of them look the SAME!” “Yes, they are both round!” “Let’s make the claw machine even trickier by trying to get more prizes that have a round shape!” "Circles" Shapes are two-dimensional figures that we can name based on their "defining attributes". Defining attributes are characteristics that a shape MUST HAVE. Let’s look at a circle. The defining attributes of a circle are that it must be a closed shape that has… A curved line that is ROUND, ... No sides,... And no corners. A circle also must be the same distance from the center all the way around. If defining attributes are characteristics a shape must have, what are NON-defining attributes? A NON-defining attribute is something that a shape has, but doesn’t always have to be the same. Size is a non-defining attribute. A circle can be big(...), big,(...) BIG… or a circle can be small,(...)small,(...)_ small. Color is another non-defining attribute. Circles can be ANY color! Circles can also face many different directions. No matter how you turn it, a circle always looks the SAME! Let’s identify circles. Is this a circle? Start by looking at the shape. Is it a closed round shape made with a curved line? Yes, it is a closed round shape made with a curved line. Does it have sides? No, it doesn’t have any sides. Does it have corners? No, it doesn’t have any corners. Is there an equal distance around from the center? Yes, there is an equal distance around the center. This is a circle. Let’s try this one. Is this a circle? Is it a closed round shape made with a curved line? Yes, it is a closed round shape made with a curved line. Does it have sides? No, it doesn’t have any sides. Does it have corners? No, it doesn’t have any corners. Is there an equal distance around from the center? No, this shape is NOT an equal distance around from the center. This shape is NOT a circle. Now that we know all the attributes of a circle, let’s see if we can help Nico and Nia find more prizes that have a circular shape. Look at the claw machine. Can you point to other prizes that have the outside shape of a circle? Here’s one! (...) This stuffed cookie! This ring also makes the shape of a circle. And here's ONE more (...) this sparklingly golden yoyo! Remember, (...) Shapes have defining and non-defining attributes. A circle is a closed round shape that is made with a curved line. It doesn't have any sides or corners... but, it must be equal distance all the way around the center. A circle can be any size,... or color, ... and face in any direction. Nico and Nia see they have ONE token left. They can only go after one more prize! I REALLY hope we get the golden yoyo, Nico!" "YAY!" "YAY!"

## Circles Exercise

Would you like to practice what you’ve just learned? Practice problems for this video Circles help you practice and recap your knowledge.
• ### Recognizing circles.

Hints

Remember that a circle has to be the same distance from the center all the way around. Here is an example.

Remember, circles must be closed shapes with one continuous curved line.

Is the shape the same distance from the center to the edge, all the way around? This example is not a circle.

Solution

The drawing of the pizza and the orange slice are circles.

The other images are not because a circle must be a closed shape, it must be the same distance from the center all the way around and be made from one continuous curved line.

• ### What is a circle?

Hints

To draw a circle, do we use a curved or straight line?

Sides are made from straight lines, not curved.

Solution
• A circle must be made from one continuous curved line all around.
• The number of sides a circle has is always 0.
• A circle must be the same distance from the center to the edge, all the way around.
• A circle is a flat 2D shape that is closed.
• ### True or False?

Hints

Which of these is a circle?

Are these all circles?

Solution

Four of the statements are true and three of the statements are false.

Some of the correct statements are about defining properties (it must be a closed shape) and some of the statements are about non-defining properties (a circle can be any size or color).

• ### How many circles are there?

Hints

Remember that circles have to be the same distance from the center all the way around.

Remember that circles can be any color and have any pattern on them.

Solution

There are 3 circles in this image.

These are the only shapes in the image that:

• Have one continuous curved line all the way around
• Are closed shapes
• Have the same distance from the center to the edge all the way around

• ### Looking for circular toys.

Hints

Does the shape have one continuous curved line all the way around?

Is the toy the same distance from the center to the edge all the way around?

There are three circular toys to find in total.

Solution

There are three circular toys: The cookie, the doughnut and the fidget toy.

These are circles because they:

• Are made from one continuous curved line
• Are closed shapes
• Are the same distance from the center to the edge, all the way around
• ### Finding circles in real life.

Hints

The face of the shape is a circle if it is made up of a continuous curved line and is the same distance from the center to the edge all the way around.

Imagine looking at the object from above, do any of the faces look like a circle?

Solution
• The ice cream cone is a cone has one circular face.
• The baked beans can is a cylinder and has two circular faces.
• The book is a rectangular prism and has no circular faces.
• The pyramid has no circular faces.
• The drum is a cylinder and has two circular faces.
• The gift box is a cube and has no circular faces.