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Вычисли угол между прямыми.

1. \(AB\parallel PN\) , \(AB∸PF\) , \(\angle FPN=42\degree\) .
2. \(AB\parallel PN\) , \(AB∸PF\) , \(\angle FPN=124\degree\) .
3. \(AB\parallel PN\) , \(AB∸PF\) , \(\angle FPN=90\degree\) .

Ответ.

1. \(\angle (AB;PF)=\) [ ] \(\degree\) .
2. \(\angle (AB;PF)=\) [ ] \(\degree\) .
3. \(\angle (AB;PF)=\) [ ] \(\degree\) .