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| Linear Approximation 2 |
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| Blue / Orange = 2 |
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| tan BFC = ϕ = 1.61803398875 |
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| Same Perimeter. Blue Area - Red Area = ??? |
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| X / Y = √2 = 1.41421356237 |
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| |AD|² + |BC|² = |BD|² + |CD|² |
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| Line Segment EF = 11.9 |
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| Easy Way: R = 10.0445753479 R = 10.0445753479 |
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| ABC = X = 162° |
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| Shaded Fraction = 6 / 13 |
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