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I don't know how to figure out what type of trigonometric ratios I have to use to find the missing side

I dont know how to figure out what type of trigonometric ratios I have to use to find the missing side class=

Respuesta :

as17
[tex]tan 15[/tex]° = [tex] \frac{x}{13} [/tex]
x =opposite side ( opposite the angle 15 degrees)
 13 = length of adjacent side 

tan = opposite / adjacent   so we use tan
tan 15 = x / 13
x = 13 tan 15
x =  3.48