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Area of Circles SACHS
Contributed by: Shanahan
A = πr2
5 cm
A = π ×      2
A = πr2
8 cm
radius = 
A = π ×      2
A = πr2
6.5 cm
A = π ×          2
A = πr2
25 cm
radius =
A = π ×           2
A = πr2
A =          × π ×      2
radius = 
360
A = πr2
9 cm
A =          × π ×      2
radius = 
360
A = πr2
60
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12 cm
A =          × π ×        2
radius = 
360
A = πr2
10 cm
4 cm
radius = 
Rectangle
Semi-circle
A1 = 10 ×
A2 =          × π ×        2
360
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