d=2r, d=2x12mm=24mm
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12mm - half the diameter.
The radius is half of the diameter, and 1/2 of 24 is 12. The radius is 12mm.
If the diameter is 12mm then the radius is 6mm. The area of a circle is pi X r2. Therefore pi X 36 mm2 = about 113.0973 mm2 = area of the circle. Don't forget units!! pi is about 3.1416.
The radius of a circle is half of its diameter
1/2 of the diameter