Jawabanmu

2014-01-10T20:13:36+07:00
Alas = tinggi
L = 1/2 a x t
L = 1/2 a x a
72 = 1/2  a^{2}
72 x 2 =  a^{2}
144 =  a^{2}
a =  \sqrt{144}
a = 12

Hipotenusa =  \sqrt{12^{2} + 12 ^{2}  }
                   =  \sqrt{144 + 144}
                   =  \sqrt{288}
                   = 12 \sqrt{2}