Respostas

2014-06-02T20:36:42-03:00
C²=a²+b²-2abcosC
<=> cosC = (a²+b²-c²) / 2ab
<=> cosC = [5²+(√2)² - (√17)² ] / 2.5 √2
<=> cosC = √2/2
<=> C = 45º 
denada :D
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