@firstname.lastname@example.org I wrote down all the equations I could think of and then messed about with them until the answer emerged. From other responses, people are having trouble visualising the situation, making that approach basically impossible.
It turned out more interesting than I expected, by the way, and the conclusion was a little surprising. I'm still hunting for insight, but one approach sent to me by email seems to hold the clue.
Freelance proofreader and editor, hobbyist maths geek.
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