The value of cosine theta (cosθ) for the given triangle is determined as 4.58/5.
Complete side lengths of the triangle
For a given sine value of a triangle, the remaining side length of the triangle can be calculated as follows;
sinθ = opp/hypo = 2/5
- opposite side = 2
- hypotenuse side = 5
Adjacent side of the triangle
b² = 5² - 2²
b² = 21
b = 4.58
Value of cosine θ
Cosθ = adj/hypo
Cosθ = 4.58/5
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