I'm guessing that you want to calculate the middle horizontal line. The upper left triangle on the left is a 45 45 90 triangle. The hypotenuse is 12 and so the leg is 12 * (1/square root of 2) leg = 12 *
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0.7071067812
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leg =
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8.4852813742
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So that means the line =
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16.9705627485
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