The area was approx 19.6 square units.
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The circumference of a circle, if its diameter is 5cm, is about 15.71cm
Radius of a circle is half its diameter, 1/2 of 5cm =2.5cm
cicumference = pi*5 cm area = pi*2.52 square cm
If you mean area of a circle then it is: pi*2.5^2 = 20 square cm rounded to nearest whole number
A sphere with a diameter of 5cm has a volume of 65.45 cm3