OK. I had maths today, and I got an answer out of the back of the book, 'cause I couldn't figure it out.
--------------------------------------------------------------------------------

Wire mesh contains 10cm by 10cm holes and is to be 1M in width.
How much wire is required to make a 10m length of the mesh

I got 211m...... (out of the book )

?????????

What have I done, or what has the book done?

Well Done to anyone who can get this...