To find the hypotenuse of a 45 45 90 triangle, multiply the leg by sq root (2)
8 * sqrt(2) = 8 *
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1.4142135624
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=
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11.313708499
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Source:
http://www.1728.org/trig2.htm
Perimeter = 2 widths + 2 length
356 = 2(84) + 2 length
356 = 168 + 2 length
356-168 = 2 length
188 = 2 length
so length = 188/2 = 94 yards