fmla value for shapes

[ashanaik]

How fmla value is determined in drawing.xml:

<a:prstGeom prst="snip2SameRect">
<a:avLst>
<a:gd name="adj1" fmla="val 7000"/>
<a:gd name="adj2" fmla="val 7000"/>
</a:avLst>
</a:prstGeom>

What would be fmla value for adjust shape radius of 15mm .

How is the conversion of mm into fmla done?

Please find the attached excel for reference.