Divide the diameter by 2. (The radius is 1/2 of the diameter.)
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16 cm
Since: area = pi * radius2 Then: Radius = square root ( area / pi ) And: Diameter = radius * 2
yes the radius is half the diameter. It goes from the edge of the circle to the centre.
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.
Multiply the diameter by 3.14 (pi).