Answer:
(c) 21
Step-by-step explanation:
I think the drawn was misprinted. In the picture attached, the correct drawn is shown.
From definition:
cos(β) = adjacent/hypotenuse
For angle = 30°, the adjacent side is x. On the other hand, the hypotenuse of the triangle is 24 units long. Replacing this information into the equation:
cos(30°) = x/24
x = cos(30°)*24
x ≈ 21
