Question

Need help finding the trigonometric ratio for A

Answer 1

cos A =
`(4)/(5)`

Explanation:

In relation to ∠ A

the side opposite is BC

the side adjacent ( next to ) is AC

the hypotenuse is the side opposite the right angle

Then

cos A =
`(adjacent)/(hypotenuse)` =
`(AC)/(AB)` =
`(20)/(25)` =
`(4)/(5)`