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½d₁=4√2
d₂=6√2
½d₂=3√2
a= bok rombu
z pitagorasa:
a²=(4√2)²+(3√2)²
a²=32+18
a²=50
a=5√2=bok rombu
6√2:2=3√2
√[(3√2)²+(4√2)²]=√(18+32)=√50=5√2
Odp. Długość boku rombu wynosi 5√2.