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1dm - bok rombu
p=1dm+60%=1,6dm
p/2=0,8dm
x²+0,8²=1²
x²=1-0,64
x²=0,36
x=0,6
x/2=q
q=1,2
P=p×q/2
P=1,6×1,2/2=0,96dm²