Question

What is COS A?


3/4

4/3

3/5

4/5

Answer 1

Cos A = 3/5

Explanation:

We are given a right angled triangle, ΔBCD, with all three side lengths known and we are to find the value of Cos A.

We Cos is the ratio of the base of the triangle to its hypotenuse, with respect to the angle (here angle A).

Considering the angle A, our perpendicular is CD, base is BC and hypotenuse BD.

Therefore, Cos A = BC/BD = 3/5

Answer 2

Answer: third option

Explanation:

As you can see in the figure attached, the triangle is a right triangle.

Then, you can calculate cosA as it is shown below:

- You need to remember the following:

`cos\alpha=(adjacent)/(hypotenuse)`

- Now, you must substitute values. Based on the figure:

`adjacent=3\\ hyppotenuse=5`

`\alpha=A`

Therefore, you obtain that cosA is:

`cosA=(3)/(5)`