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A circle is labeled by its center. Circle A A B Circle B C Circle C
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Circle Terminology
CircleThe set of points in a plane that are a fixed distance from a given point called the center of the circle.
A circle is labeled by its center.
Circle A
A
B
Circle B
C
Circle C
Chord
• A segment joining two points on a circle
• Example: ABB
CAA
B
Diameter
• A chord that passes through the center of a circle.
• Example: ABO
A
B
A
B
Name the following:
, or GO
What is the relationship between the radius and the diameter?
If you said:
The diameter is twice the radius.
The radius is half of the diameter.
You are absolutely correct.
What is the………
Radius = 7 cm
Diameter = 14 cm
Radius = 13 km
Diameter = 26 km
1. What circle has a diameter of 7 mm?2. What circle has a radius of 7 km?3. What circle has a diameter of 8 m?4. What circle has a radius of 12 m?5. If the circles were drawn to scale, which circle would be the smallest?
1. What circle has a diameter of 7 mm? Circle J2. What circle has a radius of 7 km? Circle B3. What circle has a diameter of 8 m? Circle E4. What circle has a radius of 12 m? Circle G5. If the circles were drawn to scale, which circle would be the smallest? Circle J