Respuesta:
37 ; la correcta es la opción a )
Explicación paso a paso:
Aplicando la ley Coseno.
[tex](25)^{2} =(40)^{2} + (39)^{2} -2(40)(39)Cos(x)[/tex]
[tex]625 = 1600+1521-3120Cos(x)[/tex]
[tex]625 = 3121-3120Cos (x)[/tex]
[tex]3120Cos(x) = 3121-625[/tex]
[tex]3120Cos(x) = 2496[/tex]
[tex]Cos(x) = \frac{2496}{3120}[/tex]
[tex]Cos(x) = 0.8[/tex]
[tex]x = Arc Cos (0.8)[/tex]
[tex]x = 36.87[/tex]
Redondeando: x = 37
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Respuesta:
37 ; la correcta es la opción a )
Explicación paso a paso:
Aplicando la ley Coseno.
[tex](25)^{2} =(40)^{2} + (39)^{2} -2(40)(39)Cos(x)[/tex]
[tex]625 = 1600+1521-3120Cos(x)[/tex]
[tex]625 = 3121-3120Cos (x)[/tex]
[tex]3120Cos(x) = 3121-625[/tex]
[tex]3120Cos(x) = 2496[/tex]
[tex]Cos(x) = \frac{2496}{3120}[/tex]
[tex]Cos(x) = 0.8[/tex]
[tex]x = Arc Cos (0.8)[/tex]
[tex]x = 36.87[/tex]
Redondeando: x = 37