My solution is entirely non-geometric.
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Welcome to the forum.
Nice problem. Had an idea but kept messing up the algebra. Here's my final version:
Bob
]]>Are you posting a puzzle? You ought to post in 'Games and Puzzles' topic, not 'Help me' topic.
]]>No calculators, please. Well, you can’t use a calculator anyway; that value is irrational so a calculator won’t give you the exact result.
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