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

Verified Answer :

as17

\(tan 15\)° = \(\frac{x}{13}\)

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

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