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b-a=4dm
b=a+4dm
2a+2(a+4)=12
2a+2a+8=12
4a=4
a=1dm
b=1+4
b=5dm
P=b*h
α=45
h/1=sin45
h=sin45
h=√2/2
P=5*√2/2
P=5√2/2dm²