12. Un triángulo rectángulo tiene un ángulo recto que mide 180 grados 13.Pitágoras dio a conocer una prueba para su teorema siglo VI A. C.
14. El lado opuesto al angulo recto se llama hipotenusa

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?