The answer will be 28 cm because I know that the base is 32 cm, so I find 1/2 of it to get16 cm. Next, I got this formula which is a^2+b^2=c^2, so I just replace the number that already have in the text which is
16^2+ b^2=32^2
196+b^2=1024
b^2=828
Square root for both side
b is about 28 cm. Hope it help!