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2a²+4a*h=18 /:2
a²+2a*4/a²-9=0 /*a , a>0
a³-9a+8=0
a³-a-8a+8=0
a(a²-1)-8(a-1)=0
(a-1)*[a(a+1)-8a+8]=0
(a-1)(a²-7a+8)=0
a=1 v Δ<0
Odp. a=1cm, h=4cm.