Circles Vocab
Presentation
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Mathematics
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9th - 10th Grade
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Practice Problem
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Medium
+2
Standards-aligned
Marjorie Hahn
Used 23+ times
FREE Resource
6 Slides • 9 Questions
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Circles Vocab
5.1 Radius, Diameter, and Circumference
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Poll
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The Basics
A circle is a set of points equidistant from a given point. The radius of a circle, r, is the distance from the center of the circle to the circle. A circle's size depends only on its radius. The center of the circle below is point A. We call this circle “circle A,” and it is labeled ⨀A.
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Open Ended
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Vocab to Learn
Radius: The distance from the center of the circle to its outer rim.
Chord: A line segment whose endpoints are on a circle.
Diameter: A chord that passes through the center of the circle.
Secant: A line that intersects a circle in two points.
Tangent: A line that intersects a circle in exactly one point.
Point of Tangency: The point where a tangent line touches the circle.
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Multiple Choice
What is the name of this circle?
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Multiple Choice
Which segment is a chord?
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Multiple Choice
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Multiple Choice
What is ?
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Let's say as many statements about this diagram as possible.
At least 3 in school and 3 at home participants!
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Circumference
Circumference is the distance around a circle. The circumference can also be called the perimeter of a circle. However, we use the term circumference for circles because they are round.
Circumference Formula: C=πd where the diameter d=2r, or twice the radius. So C=2πr as well.
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Circles Vocab
5.1 Radius, Diameter, and Circumference
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