@Holliwood#:
Answer:
There are 5 lines that are perpendicular to the line AB
Explain the solution steps:
According to the article we see:
AB² + AC² = BC²
⇔ AB ⊥ AC ( the theorem py - ta - go inverse )
⇒ AB ⊥ A'C'
We have: ABC.A'B'C '(vertical square prism)
⇒ AB ⊥ BB'; AA'; CC'
So AB is perpendicular to the 5 segments
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