C. Linii

Se aseaza la masa si noteaza pe un mic carnetel ce are de facut pentru ziua de maine. Sa isi sune varul ca sa il felicite pentru ziua onomastica, sa reinoiasca abonamentul telefonic, ... Din lipsa de inspiratie, traseaza 3 linii care prin intersectie construiesc un triunghi. Apoi traseaza inca o linie si realizeaza ca obtine numarul maxim de triunghiuri posibile. Care este acesta? Dar prin trasarea a 5 linii, cate triunghiuri se pot obtine maxim?

Sursa: M.Gardner

 

C. Lines

He sits down to the table and notes on a small notebook what he needs to do tomorrow. To call his cousin for his birthday, to pay the mobile phone bill, …. Because lack of inspiration, he draws 3 lines that by intersection build a triangle. He then draws another line and obtains the maximum possible number of triangles. What is the number? Similar, how many triangles can be obtained maximum by 5 lines?

Source: M.Gardner 

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