The area of a cirle is:
PI * r2
Where "r" is the radius, and PI is approximately 3.14.
Hint: A radius is half of the diameter.
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Since: area = pi * radius2 Then: Radius = square root ( area / pi ) And: Diameter = radius * 2
16 cm
Circumference of circle: 5.5 times pi
Multiply the diameter by 3.14 (pi).
yes the radius is half the diameter. It goes from the edge of the circle to the centre.