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d=a+4
2a²=(a+4)²
2a²= a²+8a+16
-a²+8a+16=0
Δ=128
√Δ=8√2
a>0
a=4+4√2
P=a²
P=(4+4√2)²
P=48+32√2
P=16(3+2√2) cm²