It is 0.000000001 metre.
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It is 0.000000001
assuming 1 is 1 metre which is 100cm or 1,000mm then 15cm is 15/100 = 15% of 1 metre
1 metre is a length or distance measure and 1 square metre is an area. One cannot be converted to the other.
2
It is 1/100.