Answer:
l( longer side ) = 12cm
S (shorter side) =9cm
D's( distance between the shorter side). ( It is also the height. I hope you got the clue…)
Anyway,
Area=9X8=72cm^2
Distance of the longer sides is
Area/the length of the longer side
72/12=6cm…
Distance between the longer sides is 6cm
Hope this helps…