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Area of a circle
Author:
craigh6125
,
Gary Andon
Topic:
Area
,
Circle
GeoGebra
Pi is the magic number for use with circles. It is the constant when determining the area or circumference of a circle. For area, it is Pi (r
2
). Lets say that r = 5cm. The area of this circle is 3.14 x 5
2.
It is about 78.5cm
2
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