The value of x, using the cosine ratio, is approximately: 11.47.
How to Apply the Cosine Ratio?
The cosine ratio is:
Cos ∅ = adjacent length/hypotenuse length.
Given the parameters:
∅ = 55°
Adjacent length = x
Hypotenuse length = 20
Apply the cosine ratio:
cos 55 = x/20
x = (cos 55)(20)
x ≈ 11.47
Learn more about the sine ratio on:
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