Assuming that the measurements refer to a rectangle, the diagonal would be
sqrt(272 + 122) = sqrt(729 + 144) = sqrt(873) = 29.55 ft (to 2 dp)
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By Pythagoras, (Diagonal)2 = 362 + 562 = 1296 + 3136 = 4432 sq ft So diagonal = +sqrt(4432) = 66.75 ft
Divide by '12' 27/12 = 2 ft 3 inches or 2.25 ft.
Approximately 17 feet.
Using Pythagoras Theorem then the diagonal = √(242 + 242) = √1152 = 33.94 ft (2dp)
Sqrt(282 + 402) = a whisker under 48 ft 10 in