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a+2=a∫2
a∫2-a=2
a(∫2-1)=2
a=2/∫2-1*∫2+1/∫2+1=2∫2+2/1=2∫2+2
P=a²=(2∫2+2)²=12+8∫2
d=a+2
a√2=a+2
a√2-a=2
a(√2 - 1)=2 /:(√2 - 1)
a=2/(√2 - 1)
P=a²
P=[2/(√2 - 1)]²
P=4/(2-2√2+1)
P=4/(3-2√2) * (3+2√2)/(3+2√2)
P=4(3+2√2)/(9-4*2)
P=4(3+2√2)/(9-8)
P=(12+8√2) cm²