0 cm, since it is not visible.
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The diameter is six cm.
A 3 centimeter diameter circle has an area of 7.068 cm2
The diameter of any circle is twice the radius. Since the radius of this circle is 15mm, the diameter is 15mm*2=30mm. 30mm is also 3cm.
Assuming this is a rectangular block, you are supposed to multiply the three numbers.
2x3x2=12cm3