Respuesta :

caylus

Answer:

Hi,

Step-by-step explanation:

Using Al'Kashi theorem (law of cosines),

x²=26²+19²-2*26*19*cos(31°)

x²= 190,11870690...

So

[tex]x=\sqrt{190.11870690} =13,7883540...\approx{13.8}[/tex]

I hope that this is not a control.