Question 596749
a^2 + b^2 = c^2


17^2 + 6^2 = c^2


289 + 36 = c^2


325 = c^2


c^2 = 325


c = sqrt(325)


c = sqrt(25*13)


c = sqrt(25)*sqrt(13)


c = 5*sqrt(13)


c = 18.027756



So the length of the diagonal is approximately <font color="red">18.027756 feet</font>.