cutting perspex

I have a large sheet of perspex that I need to cut down to fit into the opening from which I am about to remove a window. I have at my disposal a table saw, circular saw and hand saws of various sizes, but all are fitted with wood-type blades. I can't get a replacement blade as I am kind of tied at home tomorrow with deliveries of building materials and plastering materials and the nearest hardware store is over an hour's drive from here (at least one likely to carry blades of that sort).

So ... how do I cut the perspex? The sheet is a 5mm sheet, if that helps at all.

Thanks in anticipation.


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