So a good trick to remember with trig is "SOH CAH TOA"
Sine = Opposite/Hypotenuse
Cosine = Adjacent/Hypotenuse
Tangent = Opposite/Adjacent
For here, since we have the opposite side and are solving for the adjacent side, we are using tangent. Our equation will look like this: [tex] \frac{tan(25)}{1}=\frac{10}{x} [/tex]
Firstly, cross multiply: [tex] tan(25)*x=10 [/tex]
Next, divide both sides by tan(25), and your answer will be x = 21.4.
