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b=c/3
a² + b² = c²
c²=(c/3)²+4²
c² - c²/9 = 16
8/9 c² = 16 /:8/9
c² = 16*9/8 = 2*9=18
c=√18=3√2 cm
b=√2 cm
Ob=2a+2b
Ob=2*4+2*√2 = (8+2√2) cm
P=4√2 cm²