Video: Identifying Shapes

Is this a circle?

01:22

Video Transcript

Is this a circle?

To answer this question, we need to define what a circle is. The definition of a circle is all points that lie an equal distance from a center point. In a circle, here’s a center point. Here is one point that is two centimeters away from the center. The circle will be made up of all points two centimeters away. Every point on this curved-looking line is two centimeters away from the center. And altogether, it makes up a circle.

An important thing to note about this circle is that it is flat. It is not a three-dimensional object. The shape that we were originally given is 3D. It is not a circle. The shape does have two circular bases. But it is not a circle. The answer to the question “Is this a circle?” is no.

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