Find the value of x to the nearest tenth.
Cosine (theta) = (Adjacent)/(hypotenuse)
cos 39 = 7/x
x cos 39 = 7
x = 7/cos 39
x = 7/0.2667
x = 26.29
Therefore, the answer is C.
Here are the general rules:
1. sine (theta) = Opposite / Hypotenuse
2. Cosine (theta) = Adjacent / Hypotenuse
3. Tangent (theta) = Opposite / Adjacent
You can use the phrase SOHCAHTOA to master the above rules.
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