Question 366869
the tape is the hypotenuse of a right triangle , while the 9 in and the true length are the two sides


(13 ft 6.25 in)^2 = (t)^2 + (9 in)^2


162.25^2 = t^2 + 9^2 ___ t^2 = 162.25^2 - 9^2 ___ t = sqrt(162.25^2 - 81)