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Circumference and Area: Circles
Formulas C = πd or 2πr A = πr2
Definitions: Circle- the set of all points in a plane that are the same distance from a given point, called the center.
The distance from the center to any point on the circle is called the radius.
The length of the radius is equal to ½ the length of the diameter.
The distance across the circle through its center is the diameter.
The circumference is the distance around the circle.
pi ( ): A number, 3.141592..., equal to (the circumference) / (the diameter) of any circle.
For any circle with a diameter, d the circumference, C is found by using this formula
Remember that, for any circle, the diameter is twice the radius or d = 2r.If we are told the radius instead of the diameter we use the formula:
The circumference of a circle is the product of pi and the diameter (or twice the radius).
The area of a circle is the product of pi and the square of the radius.
Arc- a curved line that is part of the circumference of a circle.
Chord- a line segment within a circle that touches 2 points on the circleDiameter is a special chord that goes through the center.
Radius- Is the edge to the middle of the circle. Diameter- It goes throw the whole center of the circle.
C=π d C=2πr r=½d d=rx2 A=πr² The diameter is the longest chord. The ratio of the circumference is always …. π is a Greek letter. π can also.
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