1 Answer

Thierry J · Answer 1 · 2023-11-11T08:58:23+0000

Given: A right-angled triangle with AB=30 units, BC=40 units, and AC=50 units.

Required: To find the trigonometric ratio cos(A).

Explanation: The trigonometric ratio cosine is defined as the ratio of the adjacent side to the triangle's hypotenuse.

$cos(\theta)=\frac{adjacent\text{ }side}{hypotenuse}$

Here, in triangle ABC, the adjacent side for angle BAC is AB, and AC is the triangle's hypotenuse.

Hence

$\begin{gathered} cos(A)=(AB)/(AC) \\ =(30)/(50) \\ =(3)/(5) \end{gathered}$

Final Answer:

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