What happens to uncertainty when I divide values by a constant and squ

The values below are different wire thicknesses measured with a micrometer screw gauge. The uncertainty of it is +/- 0.01mm.

Diameter/thickness of wire/mm
0.02
0.10
0.14
0.30
0.42

I need to halve (or divide by two) these values to calculate radius and hence calculate cross sectional area of the wires. What happens to the uncertainty of +/- 0.01mm.

In addition what happens to the uncertainty of the radius when I square these values using the equation area of circle = πr2 ?

This is for a physics investigation.

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