definition: a circle is the set of all points on a plane that is a fixed distance from the center
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Circle
By Juanita Bernal
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Circle
Definition:
A circle is the set of all points on a plane that is a fixed distance from the center.
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Definitions
Circumference of a circle is the length around it, also known as the perimeter.
Diameter of a circle is the length of the line through the center and touching two points on its edge.
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DefinitionsRadius of a circle is the length of the line from the center to any point on its edge.
Area of a circle is the number of square units inside of it.
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CircumferenceThe circumference of a circle can be calculated from its diameter using the formula :
Circumference = pie x diameter ( pie = 3.14 )
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Circumference
Example : 18.84 = 3.14 x 6 3.14 6 is the diameter x 6 3.14 is pie 18.84
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Diameter
The diameter of a circle can be calculated using the following formula:
Diameter = 2 x radius (r)
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Diameter
Example : 20 = 2x 10 (r) 20 is the diameter 10 is the radius (½ diameter)
10 x 2 20
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Radius
The radius of a circle can be calculated using the following formula:
Radius = diameter / 2
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Radius
Example: 5 = 10 / 2 10 is the diameter ( radius ) 5 is half 10 (diameter)
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Area
The area of a circle can be calculated by using the following formula:
Area =
Example: 113.04 = 3.14 x
r = 6
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