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12 cards from this deck
A=pir2A = pi r^2A=pir2
Area
Radius of the circle
Distance from centre of circle to any point on its edge
Radius is half the diameter
Divide it by 2 to find the radius
Distance across the full width of the circle
rac{1}{2} imes pi imes r^2
Using diameter instead of radius in the formula
Square units
Use the π button for accuracy
Radius is squared in the formula
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