Question

For this right triangle, what is the cosine of angle C?

A)
12
13
B)
13
12
C)
5
12
D)
5
13
E)
13
5

Answer 1

A

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