Answer:
A
Step-by-step explanation:
In this triangle hypotenuse=13
And perp=5
Now
Finding base
Hypotenuse^2=base^2+perp^2
(13)^2=base^2+(5)^2
169=base^2+25
Base^2=169-25
Base^2=144
Taking sq root on both sides
Base=12
Now
Cosine C=base/hypotenuse
Cosine C=12/13
