Art and maths

Jack smith

New member
Joined
May 12, 2017
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Hi, I am busy doing some art. My maths has never been my strong suit. I need to calculate how many millimetres on a photo will equal that many millimetres on the canvas. How do I go about it? Appreciate any help
 
Typically, measure the entire breadth and length of both. This ratio should be constant.
 
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