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d=2r
a=6cm
a²+a²=d²
2a²=d²
d=√(2a²)=a√2
po podstawieniu d=6√2
6√2=2r /:2
3√2=r
x = 6√2 cm
d = 6√2 cm
r = 3√2 cm
a² + a² = l²
6² + 6² = l²
36 + 36 = l²
l² = 72
l = 6√2
r = 3√2