Then you can calculate the length of the other segment, gj, using Pytagora's theorem, because when you are talking about hypotenuese you know that it is a right triangle.
hypotenuse^.2 = leg1^2 + leg2^2
(6 cm)^2 = (2 cm)^2 + (segment gj)^2
segment gj^2 = 36 cm^2 - 4cm^2 = 32 cm^2
segment gj =√(32 cm^2) = 5.66 cm
