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b² + (3√2)² = 7²
b² = 49 - 18
b = √31
P = 3√2 × √31
P = 3√62
z Pitagorasa:
a²+(3√2)²=7²
a²+9*2=49
a²+18=49 /-18
a²=31
a=√31
P=√31*3√2=3√62