Answer:
cos C = 4/5
Hence, the third option i.e. 4/5 is correct.
Step-by-step explanation:
Given the right triangle ΔABC
Given
- The side adjacent to ∠C is 36.
We know the trigonometric ratio such as
cos Ф = adjacent / hypotenuse
substitute Ф = C, adjacent = 36, and hypotenuse = 45
cos C = 36 / 45
cos C = [9 × 4] / [9 × 5]
cancel the common factor: 9
cos C = 4/5
Thus,
cos C = 4/5
Hence, the third option i.e. 4/5 is correct.
