For this case we use Heron's formula to calculate the area of the building. We have then: A = root ((s) * (s-a) * (s-b) * (s-c)) Where, s = (a + b + c) / 2 Substituting values: s = (83 + 189 + 178) / 2 s = 225 feet A = root ((225) * (225-83) * (225-189) * (225-178)) A = 7352.509776 feet ^ 2 Rounding off we have: A = 7353 feet ^ 2 Answer: The ground area K covered by the building is: K = 7353 feet ^ 2