Answer :
find ratio of the 2 shortest sides 4 & 6
4/6 = 2/3 = 0.666666
them multiply longest side by that so 9 * 2/3= 6
so longest side is 6
find ratio of the 2 shortest sides 4 & 6
4/6 = 2/3 = 0.666666
them multiply longest side by that so 9 * 2/3= 6
so longest side is 6