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c=7cm
a=3 √2
b=?
a*b= Pole
c^2=a^2+b^2
b^2=c^2-a^2
b^2=49-18
b^2=31
a*b=3 √62
a²+b²=c²
więc liczymy najpierw polowe tego prostokata (ten trojkat)
(3√2)² + x² = 7²
(9*2) + x² = 49
x² = 49-18
x² = 31
x = √31
Obw.
2* √31 + 2*(3√2)
obw = (2√31 + 6√2) cm