Here, we want to get the value of the cosine of A
Mathematically, the cosine of an angle is the ratio of the adjacent to the hypotenuse
The hypotenuse is the longest side which faces the right angle
This value is 26
The adjacent is the side other than the opposite and hypotenuse
The opposite is the side that faces the angle given which is 24 in this case
That means that the adjacent is the side that measures 10
Hence, the cosine of the angle will be 10/26