What is a Circle?

“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!"