$\"\"$

From the diagram the diameter of the circle is 32 mm; $\"\"$

The circumference of a circle formula is $\"\"$

$\"\"$ (Substitute 3.14 for $\"\"$ and 32 for d)

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ ( $\"\"$ ) $\"\"$

The circumference of the circle is 100 mm.