Area of a circle = pi*r2 , where pi = 3.14 and r is the radius of the circle.
We have diameter(d) = 12mm so, radius(r) = d/2 = 6mm
On putting the values we get
Area = 3.14*62 = 3.14*36 = 113mm2
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The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
A circle with a diameter of 25 mm has an area of 490.9 square mm.
Area = pi*282 square mm
Area = pi*552 square mm
If the diameter of a circle is 5.4mm, then the radius is 2.7 mm. The formula for the area of a circle is PIr^2. So, the area is then 22.9 mm2.