How do I figure out the approximate number of balloons to make a spiral arch?
Comments for how to calculate a spiral arch?














I am making 10' Spiral Columns with a 3' round on top. Pretty simple and basic. Just curious to know what the formula is in precisely determining the number
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When I go to make the balloon anchor, what size balloons do I use for the anchor and what size are the link balloons? Where can I get them in the US?