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d2=22cm
obl u-bok rombu
u/x=d1/a
v/(a-x)=d2/a
dziele stronami
u(a-x)/(vx)=d1/d2
(a-x)/x=9/11
a-x=9/11x
a=20/11x--->x=11/20a wstawiam do pierwszego
ua=d1x---->ua=d1*11/20a
u=11/20d1
u=11/20*18=9,9cm
odp. bok rombu to 9,9cm