- right angle
- obtuse
- straight
- acute

Answer: Option 4

Explanation:

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Os livros são escritos devido a anos virados do avesso por ideias que não nos libertam até serem escritas e, até mesmo então, a escrita é o último recurso, um resgate desesperado que pagamos para que a vida nos seja devolvida.

-Richard Bach
Running from Safety: An Adventure of the Spirit