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a²=1/4a²+(4/9*3)/4
3/4a²=1/3 /*4/3
a²=4/9
a=2/3
obw =3*2/3=2
a²=1/4a²+(4/9×3)/4
3/4a²=1/3 /×4/3
a²=4/9
a=∫4/9
a=2/3
Ob=3a
Ob=3×2/3
Ob=2cm.