From a square of 12 dm perimeter is cut smaller square, whose side is the third side of the square. What is the area of the rest?

Correct result:

S =  8 dm2


o=12 dm a=o/4=12/4=3 dm  a2=a/3=3/3=1 dm  S1=a2=32=9 dm2 S2=a22=12=1 dm2  S=S1S2=91=8 dm2

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