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| Angle BEC = X = 62° Easy Way: Angle BEC = X = 62° |
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| Blue Area = 0.475631138267 |
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| Five Circles. One Semicircle. |
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| Angle BAO = α = 45° |
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| Angle BAO = α = 105° |
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| Orange = 9.77357067506 |
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| Shaded Fraction = 3/4 = 0.75 |
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| Ratio of s / ( 2 R₁ ) = 2 |
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| Radius R = 0.414213562373 |
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